Calcaneal stress fractures are overuse injuries in which repetitive loading produces microscopic damage within the heel bone faster than normal remodelling can repair it. They are less common than tibial or metatarsal stress fractures, yet they are an important cause of persistent heel pain in runners because early symptoms can resemble plantar fasciopathy, Achilles-related pain or a simple heel bruise. Delayed recognition may allow a bone stress reaction to progress to a visible fracture. Fortunately, most calcaneal stress fractures are considered low-risk injuries and heal with conservative care. Effective management, however, requires more than rest: clinicians and runners must identify the training, biomechanical, nutritional and medical factors that disturbed the balance between load and bone capacity.

Mechanism and Risk Factors

The calcaneus transmits substantial forces at initial contact and helps transfer load from the hindfoot to the forefoot during stance. Running subjects it to repeated compression through ground-reaction forces and the opposing pull of the Achilles tendon and plantar fascia. Bone normally adapts to these demands, but abrupt or excessive loading creates microdamage. When osteoclastic resorption temporarily exceeds new bone formation, a stress reaction may develop and eventually form a fracture line.

A rapid increase in mileage is a classic precipitant, but intensity, hills, speed sessions and training frequency are equally important. Returning too quickly after inactivity, changing to a harder surface, beginning military-style conditioning or making a sudden footwear transition may also increase load. Fatigue can alter running mechanics and reduce muscular shock attenuation. Individual factors include previous bone stress injury, low bone mineral density, inadequate recovery, smoking, certain medications and conditions that impair calcium or vitamin D metabolism.

Low energy availability deserves particular attention. When dietary energy is insufficient for both exercise and normal physiology, hormonal and skeletal health may deteriorate. This process forms part of relative energy deficiency in sport (RED-S) and can affect runners of any sex. Menstrual disturbance in women, reduced libido or testosterone in men, recurrent injuries, weight loss and restrictive eating are warning signs rather than markers of athletic fitness. Older runners and athletes with osteoporosis or systemic illness may sustain an insufficiency-type injury under otherwise ordinary loads.

Clinical Presentation and Diagnosis

The typical symptom is gradually increasing pain beneath or around the heel. Initially, discomfort may occur only near the end of a run and settle with rest. As injury severity increases, pain begins earlier, persists after exercise and may interfere with walking. Examination commonly reveals focal tenderness over the posterior or plantar calcaneus and pain when the medial and lateral sides of the heel are compressed together—the calcaneal squeeze test. Swelling, warmth or an antalgic gait may be present. Nevertheless, no single examination finding is conclusive.

Differential diagnosis is broad. Plantar fasciopathy usually causes medial plantar heel pain that is prominent with the first steps after rest, while Achilles tendinopathy is centred near the tendon insertion or midsubstance. Other possibilities include heel-pad syndrome, retrocalcaneal bursitis, nerve entrapment, inflammatory disease, infection and, less commonly, tumour. A careful history should therefore examine training change, pain behaviour, nutrition, menstrual or endocrine health, medications and previous fractures.

Plain radiographs are normally the first imaging test because they can identify alternative pathology and may later show sclerosis or a fracture line. Early radiographs, however, are frequently normal because bone changes take time to become visible. A normal X-ray must not override a strongly suggestive clinical picture. Magnetic resonance imaging is the preferred confirmatory investigation because it detects marrow oedema and fracture morphology without ionising radiation. Computed tomography can define cortical detail or assess uncertain healing, whereas bone scintigraphy is sensitive but less specific and is now used less often.

Treatment and Rehabilitation

Most calcaneal stress fractures heal without surgery. The immediate priority is to stop running and other painful impact activity. Weight-bearing should be guided by symptoms: a runner who can walk comfortably may need only activity modification and supportive footwear, whereas substantial pain, limping or pain during daily activities may justify a walking boot and temporary use of crutches. Analgesia should be discussed with a clinician; repeated use of non-steroidal anti-inflammatory drugs is sometimes discouraged because of concern about bone healing, although human evidence is not definitive.

Rehabilitation should preserve fitness without repeatedly provoking the injury. Deep-water running, swimming or cycling can be introduced if completely pain-free. Calf, foot and proximal lower-limb strength, balance and movement control should be rebuilt progressively rather than treating the heel in isolation. Clinicians should assess energy intake, protein, calcium and vitamin D, but supplements are not substitutes for adequate nutrition and should target demonstrated deficiency or clinical need. Recurrent injuries, RED-S features or unusual fractures warrant medical investigation, potentially including blood tests and bone-density assessment.

Return to running should be based on function rather than a fixed date. The athlete should first be pain-free in daily life and able to walk briskly, hop and perform relevant strength tasks without symptoms during the activity or the following day. A graded walk–run programme can then begin on level ground, with recovery days between sessions. Duration should increase before speed, hills and consecutive running days. Pain that returns during a session, later that day or the next morning signals that loading has advanced too quickly. Uncomplicated injuries may settle within approximately six to eight weeks, but complete return to previous training often takes longer and varies with injury grade and underlying risk factors.

Prevention and Conclusion

Prevention depends on matching training stress to the runner’s capacity. Mileage and intensity should rise gradually, hard sessions should be separated by recovery, and persistent focal heel pain should not be “run through.” Strength training, sufficient sleep, adequate energy intake and timely replacement of unsuitable footwear can support tissue capacity, although no shoe can compensate for excessive load. Training plans should account for recent illness, inactivity and life stress as well as weekly distance.

Calcaneal stress fractures illustrate the continuum of bone stress injury: a potentially reversible stress reaction can become a fracture if warning symptoms are ignored. Early clinical suspicion, appropriate MRI when required, protection from painful loading and correction of contributing factors usually produce an excellent outcome. For runners, the safest route back is neither prolonged complete inactivity nor a rushed return, but progressive loading guided by symptoms, function and bone health.

References

American Academy of Family Physicians (2003). “Common Stress Fractures.” American Family Physician, 68(8), 1527–1532. https://www.aafp.org/pubs/afp/issues/2003/1015/p1527.html

Mayer, S. W., Joyner, P. W., Almekinders, L. C. and Parekh, S. G. (2014). “Stress Fractures of the Foot and Ankle in Athletes.” Sports Health, 6(6), 481–491. https://pmc.ncbi.nlm.nih.gov/articles/PMC4212349/

Mountjoy, M. et al. (2023). “2023 International Olympic Committee’s consensus statement on Relative Energy Deficiency in Sport (REDs).” British Journal of Sports Medicine, 57, 1073–1097. https://doi.org/10.1136/bjsports-2023-106994

Welck, M. J. et al. (2024). “Stress fractures of the foot—current evidence on management.” Journal of Clinical Orthopaedics and Trauma. https://doi.org/10.1016/j.jcot.2024.102446

Foot orthoses are commonly modified to alter the distribution of plantar pressure and the moments acting across the joints of the foot. One such modification is the cuboid notch, also called a cuboid raise or cuboid pad. Despite the word “notch,” the modification creates a localised elevation beneath the cuboid rather than a hollow for the bone. It may be incorporated intrinsically into the orthotic shell during manufacture or added extrinsically with ethylene-vinyl acetate (EVA), cork, felt, or another padding material. Its intended effect is to provide a targeted reaction force beneath the lateral midfoot.

The anatomical rationale for the modification arises from the cuboid’s position within the lateral column. The cuboid articulates posteriorly with the calcaneus and anteriorly with the fourth and fifth metatarsals. It also contributes to the groove through which the peroneus longus tendon passes before crossing the plantar foot. Consequently, motion or loading around the cuboid can influence lateral-column stability, midtarsal mechanics, and medial forefoot function. A correctly positioned cuboid notch applies force to a relatively small area and may therefore affect both local tissue stress and the rotational tendency of the foot.

Clinicians prescribe the modification for several proposed purposes. A common indication is lateral midfoot pain associated with cuboid syndrome or suspected calcaneocuboid dysfunction. In this setting, the raise is intended to resist painful plantar or eversion movement of the cuboid and improve tolerance of weight-bearing. It may also be used to support a low lateral arch, reduce a sensation of the foot sliding laterally from an orthosis, or complement a device containing strong medial posting or a medial heel skive. Some practitioners employ it to encourage the centre of pressure to move medially during midstance and propulsion. This may promote use of the more efficient “high-gear” propulsive mechanism through the first and second metatarsals rather than continued loading of the lateral forefoot.

The biomechanical effect is not universally supinatory. Because the orthotic reaction force is applied lateral to several joint axes, a cuboid raise may create a pronatory moment at the subtalar or midtarsal joints. It may also plantarflex the fourth and fifth rays and, theoretically, improve the mechanical advantage of peroneus longus in stabilising the first ray. These effects can be useful when an orthosis otherwise shifts load too strongly medially. However, they also explain why the modification is not suitable for every patient with lateral pain. Its action depends on the precise location, height, contour, stiffness, footwear, and individual foot mechanics.

Accurate placement is therefore essential. A pad positioned too far laterally may increase pressure over a tender cuboid or create an unwanted eversion moment. In some cases, placing the apex more plantarmedially beneath the cuboid may better oppose the suspected direction of rotation. The modification should be smoothly contoured rather than abrupt, because a concentrated edge can cause discomfort, blistering, or avoidance gait. Its height is generally introduced conservatively and adjusted according to symptoms and functional response. Shoe depth must also be considered, as the raise occupies volume and may increase dorsal pressure within closely fitting footwear.

A practical advantage of an extrinsic pad is reversibility. Before prescribing a permanent shell modification, a clinician can conduct a treatment-direction test using adhesive felt or temporary padding beneath the corresponding area of the foot or orthosis. Improvement in pain, stability, gait, or a relevant functional task supports proceeding, whereas worsening symptoms indicates that the position, magnitude, or underlying hypothesis should be reconsidered. Once a raise has been moulded into a rigid shell it can be difficult to remove; EVA devices may be ground down, but an added pad is easier to reposition or discard.

The principal limitation of the cuboid notch is the weakness of its evidence base. Published literature describes cuboid syndrome, its proposed mechanisms, and treatments such as manipulation, taping, padding, and activity modification, but direct controlled research on cuboid notches in foot orthoses is lacking. There is no established consensus regarding indications, dimensions, or optimal placement. Clinical claims should therefore be framed as biomechanical hypotheses and experience-based practice rather than proven therapeutic effects. Lateral foot pain also has a broad differential diagnosis, including stress injury, peroneal tendinopathy, calcaneocuboid arthritis, nerve irritation, and fifth-metatarsal pathology; an orthotic modification should not substitute for appropriate assessment.

The cuboid notch is a focused and potentially useful modification for managing selected lateral-column problems or balancing the mechanical effects of an orthosis. Its value lies in the ability to apply a strategically placed plantar reaction force, yet the same force can aggravate symptoms when its direction or magnitude is inappropriate. Careful diagnosis, temporary testing, conservative dosing, accurate fabrication, and follow-up are therefore central to its use. Until stronger research is available, the cuboid notch is best regarded not as a standard correction, but as an individualised clinical trial within a broader management plan.

References

Durall, C. J. (2011). Examination and treatment of cuboid syndrome: A literature review. Sports Health, 3(6), 514–519. https://doi.org/10.1177/1941738111405965

PodiaPaedia. (n.d.). Cuboid notch. https://podiapaedia.org/wiki/foot-orthotics/design-features/lateral-column-support/cuboid-notch/

Crocs have become instantly recognizable footwear. Originally designed as practical boating shoes, they are now worn by children, workers, travelers, and comfort seekers. Their lightweight foam construction, wide shape, ventilation holes attract fans and critics. Yet the most important question is not whether Crocs are fashionable, but whether they are good for the feet. The answer is not simply yes or no for everyone. Crocs can be comfortable and useful in certain situations, but they are not ideal for every person or activity.

One of the main benefits of Crocs is their roomy toe box. Many conventional shoes squeeze the toes together, which can cause rubbing and may aggravate bunions, hammertoes, corns, or ingrown toenails. Crocs generally allow the toes to spread more naturally. This extra space can be helpful for people whose feet swell. Their soft material also reduces pressure against sensitive areas. For someone recovering from minor irritation or completing light tasks at home, this combination of space and softness may provide relief.

Crocs also offer cushioning and shock absorption. Their molded foam soles create a soft surface, making standing or walking on hard floors feel more comfortable. That benefits workers in hospitals, kitchens, and other environments where long periods are spent on concrete or tile. They are also lightweight, so the legs may feel less tired than they would in heavy footwear. Many models are washable and water-resistant, making them convenient where spills, dirt, or moisture are common.

Another advantage is their accessibility. Crocs are easy to put on and remove, which can benefit people with limited mobility, arthritis, back pain. The heel strap can provide more security than an ordinary open-backed clog, although less than a fastened walking shoe. Crocs can also protect the soles from hot pavement, rough ground, and minor household hazards more effectively than going barefoot. Around a pool, campsite, garden, or shared shower, they may therefore be a practical short-term choice.

However, comfort does not automatically mean that a shoe provides adequate support. Their moderately soft, flexible construction may not control foot movement well enough for people who need firm stability. Individuals with flat feet, significant overpronation, plantar fasciitis, or other biomechanical problems may require shoes with more structured arch support and a secure heel counter. Because every foot is different, one person may find Crocs soothing while another develops fatigue or pain. A shoe that feels pleasant for ten minutes may also become uncomfortable after several hours of walking.

The loose fit creates another concern. When Crocs are worn without the heel strap, the toes may curl or grip the shoe to keep it from slipping off. Repeated gripping can overwork small muscles and tendons in the feet and lower legs. The lack of a firmly enclosed heel may also reduce stability, especially when walking quickly, climbing stairs, or moving across uneven ground. Wearing the strap behind the heel and choosing the correct size can improve security, but it cannot transform a casual clog into an athletic shoe.

Crocs are therefore unsuitable for activities that involve running, jumping, rapid changes of direction, or long hikes. Athletic shoes are designed to hold the foot securely and provide support appropriate to repeated impact. Crocs can slide, bend, or catch on surfaces during vigorous movement, increasing the possibility of a stumble or injury. Their ventilation holes expose part of the foot, and their soft uppers provide limited protection from sharp tools, falling objects, or heavy equipment. Consequently, they should not replace protective footwear in workplaces where safety shoes are required.

Hygiene and fit also deserve attention. Although Crocs are easy to wash, feet can still sweat inside their nonporous material, potentially causing odor, friction, or skin irritation. The shoes should be cleaned and allowed to dry, and socks may help during extended wear if they do not make the fit too tight. People with diabetes, poor circulation, reduced sensation, or existing foot wounds should be especially cautious. A spacious shoe may seem safe, but unnoticed rubbing or debris inside it can damage vulnerable skin. Such individuals should seek advice from a podiatrist or other qualified healthcare professional about suitable footwear.

Whether Crocs are good for a particular person ultimately depends on fit, duration, activity, and medical needs. They are often sensible for brief errands, household use, gardening, travel, poolside wear, or work that involves moderate standing without major safety hazards. They may also serve as a comfortable alternative when swollen or sensitive feet cannot tolerate rigid footwear. On the other hand, supportive walking shoes are generally better for long distances, and purpose-built athletic or protective shoes are essential for demanding activities. Rotating between different kinds of well-fitting footwear may prevent the same areas of the feet from being stressed every day.

Crocs can be good for the feet when they are properly fitted and used for appropriate purposes. Their wide toe box, cushioning, low weight, and convenience make them comfortable for many wearers. Nevertheless, their loose heel, limited structure, and inadequate protection restrict their usefulness. They should be viewed as practical casual footwear rather than a universal solution to foot pain. Anyone who experiences persistent discomfort should not rely on a shoe alone to solve the problem, but should obtain professional assessment. Used thoughtfully, Crocs can play a helpful role in a varied footwear collection; used for the wrong activity or worn despite pain, they may create more problems than they prevent.

Modern footwear often asks the human foot to adapt to the shoe rather than requiring the shoe to accommodate the foot. Narrow toe boxes, raised heels and rigid soles can restrict the natural spread and movement of the toes. Correct Toes is a reusable silicone toe spacer designed in response to this problem. Invented by podiatrist Dr Ray McClanahan, the device sits between the toes and gently encourages them toward a wider, more anatomical position. Although it appears simple, Correct Toes represents a broader approach to foot health based on alignment, suitable footwear and gradual restoration of natural movement.

Unlike the foam separators commonly used during pedicures, Correct Toes is intended to be worn during ordinary activity. Its flexible design comes in several sizes and can be used barefoot, over toe socks or inside shoes with sufficient room. The crucial phrase is “sufficient room”: inserting any spacer into a narrow shoe may increase pressure rather than relieve it. Correct Toes therefore works most logically with footwear that has a wide, foot-shaped toe box. The manufacturer claims that this combination allows the toes to splay, encourages foot-muscle activity and may improve comfort, balance and circulation.

The reasoning behind the product begins with the mechanical role of the toes. During standing and walking, the forefoot helps support body weight, maintain balance and propel the body forward. The big toe is particularly important during push-off. When toes are crowded or the big toe angles toward the others, pressure may be distributed less comfortably across the forefoot. By creating space between the toes, a spacer can temporarily alter their position and reduce rubbing. This may benefit people troubled by overlapping toes, corns, calluses or discomfort associated with bunions, also called hallux valgus.

Correct Toes may also encourage users to think more carefully about their shoes and movement habits. A spacer cannot compensate for footwear that continually compresses the foot, just as stretching briefly cannot fully offset an entire day spent in a restrictive position. The device is therefore best understood as one element of a conservative foot-care strategy. Wide footwear, gradual strengthening, appropriate mobility exercises and professional assessment may all be equally important. In this respect, the greatest value of Correct Toes may be both physical and educational: it makes the wearer aware of toe position and the space a functioning foot requires.

Scientific evidence, however, calls for measured expectations. A 2024 systematic review of toe separators found ten eligible studies, with sample sizes ranging from nine to ninety participants. The authors concluded that separators may be valuable in conservative treatment, particularly for hallux valgus and related deformities. Yet the studies varied substantially in device type, material, treatment duration and method of use, while reporting was often incomplete. The review therefore emphasised the need for better research. Its findings support toe spacers as a potentially useful tool, but they do not prove every claim made for Correct Toes specifically.

Independent clinical guidance is similarly cautious. Toe spacers can create temporary room between crowded toes, reduce friction and make standing or walking more comfortable for some people. They should not, however, be presented as a guaranteed cure for bunions or as a substitute for diagnosis and treatment. A structural deformity can involve bones, joints, ligaments, heredity and long-term loading patterns. A soft silicone device is unlikely to reverse all these factors by itself. Symptom relief while the spacer is being worn is plausible; permanent correction is a much stronger claim and is not firmly established.

Safe use depends on patience and fit. New users should begin with short periods and increase wear gradually only if the feet remain comfortable. Pain, numbness, skin irritation, colour change or worsening symptoms are signals to stop. The spacer should not squeeze the toes, and shoes must remain roomy after it is inserted. People with diabetes, reduced sensation, poor circulation, recurring sores or complex foot conditions should consult a qualified health professional before use. Persistent pain, progressive deformity or difficulty walking also deserves assessment by a podiatrist or doctor.

Correct Toes is neither a miracle cure nor merely a wellness gimmick. It is a thoughtfully designed version of a simple orthotic idea: giving compressed toes more space. It also illustrates a principle in preventive health: small changes to everyday environments can sometimes matter more than dramatic interventions. Choosing shoes that permit natural toe movement may be as significant as choosing the spacer itself. For some wearers, it may offer comfort, reduce friction and complement exercises and better footwear. Its limitations are equally important, because current evidence does not justify promises of universal or permanent correction. Used gradually, comfortably and with realistic expectations, Correct Toes can form part of a sensible approach to foot health—one that respects the natural shape of the foot while recognising when professional care is needed.

Sources

1. Correct Toes. “The Original Toe Spacer.” Product information. https://correcttoes.com/products/correct-toes-the-original-toe-spacer
2. Krześniak, H., et al. “Toe Separators as a Therapeutic Tool in Physiotherapy—A Systematic Review.” Journal of Clinical Medicine, 2024, 13(24), 7771. https://doi.org/10.3390/jcm13247771
3. Cleveland Clinic. “What Are Toe Separators? And Will They Help?” https://health.clevelandclinic.org/benefits-of-toe-separators-and-spacers

The COVID-19 pandemic transformed an unfamiliar respiratory infection into one of the most intensively studied diseases in modern history. Although fever, cough, fatigue, and loss of smell quickly became recognized symptoms, doctors also began reporting unusual skin changes. Among the most distinctive were red or purple swellings on the toes—and occasionally the fingers—resembling chilblains caused by exposure to cold. Popularly called “COVID toes,” these lesions attracted attention because they frequently appeared in children and young adults who otherwise felt well and often tested negative for active infection. COVID toes illustrate both the wide-ranging effects of SARS-CoV-2 and the difficulty of proving that a striking clinical pattern has a single cause.

COVID toes are medically described as chilblain-like lesions or pernio-like eruptions. They most commonly affect the tips and upper surfaces of the toes but may also develop along the sides of the feet, on the soles, or on the fingers. Affected areas can become red, pink, or violet and may swell or form raised spots. Some people experience itching, tenderness, burning, or pain, while others notice only a change in appearance. Blisters, small areas of tissue damage, or crusting can occasionally occur. Unlike traditional chilblains, which usually develop after exposure to cold and damp conditions, many pandemic-era cases appeared during warm weather or in people without a history of similar problems.

Reports increased sharply during the first months of the pandemic. Dermatologists in Europe and North America described clusters of young patients with chilblain-like lesions at a time when community transmission of COVID-19 was high. The timing suggested an association with SARS-CoV-2, but an unusual pattern complicated the evidence: many affected people had negative polymerase chain reaction tests and no detectable antibodies. Some had experienced mild respiratory symptoms or contact with an infected person several weeks earlier, whereas others had no known exposure. Consequently, COVID toes became a plausible but sometimes controversial manifestation of infection rather than a simple diagnostic sign.

Several explanations have been proposed. One leading theory involves the body’s interferon response. Interferons are proteins that help cells limit viral replication. Children and younger adults may sometimes produce a rapid and powerful type I interferon response that controls SARS-CoV-2 before it causes severe illness or generates easily measurable antibody levels. That same response may promote inflammation around small blood vessels in the skin, producing chilblain-like lesions. Under this interpretation, COVID toes could be evidence of an effective antiviral defence accompanied by localized inflammation.

Other proposed mechanisms include injury to the lining of small blood vessels, activation of the immune system, and microscopic changes in circulation. SARS-CoV-2 can provoke vascular and inflammatory abnormalities, especially in severe disease, but COVID toes generally occur in people with mild or absent systemic symptoms. The lesions should therefore not automatically be equated with the dangerous blood clots associated with serious COVID-19. Some biopsy studies have found inflammation around small vessels and other changes consistent with chilblains, yet these findings do not by themselves prove that the virus directly invaded the skin.

Researchers have also considered the indirect effects of pandemic life. Lockdowns changed footwear, exercise, heating, stress levels, and exposure to cold floors. People spent more time at home, sometimes barefoot, while heightened awareness encouraged them to seek medical advice for marks that might previously have gone unnoticed. Studies comparing case numbers with infection rates have produced mixed conclusions. In some settings, chilblain-like eruptions rose alongside COVID-19 waves; in others, tests and epidemiological evidence did not support a direct link. It is possible that the label “COVID toes” includes several conditions that look alike but arise through different pathways.

Diagnosis is usually clinical. A healthcare professional examines the lesions and asks about their duration, possible cold exposure, medications, previous chilblains, COVID-19 symptoms, and contact with infected individuals. Depending on the circumstances, testing for active or past SARS-CoV-2 infection may be appropriate, although a negative result does not necessarily settle the question. Doctors may investigate alternative causes when lesions are severe, recurrent, unusually persistent, or accompanied by other symptoms. Conditions such as autoimmune disease, circulation disorders, vasculitis, pressure injuries, and ordinary cold-induced chilblains can resemble COVID toes. Rarely, a skin biopsy or blood tests may be needed.

For most patients, the outlook is reassuring. Lesions commonly resolve without treatment within several weeks, although some persist longer or recur. Keeping the feet comfortably warm and dry, avoiding tight footwear, and resisting scratching can reduce irritation. Moisturizers may protect damaged skin, while a clinician may recommend a topical corticosteroid for significant itching or inflammation. Pain relief can be used when appropriate. Antibiotics do not treat the lesions unless a separate bacterial infection develops, and blood-thinning medication should not be taken merely because the term COVID toes suggests a circulation problem.

Certain warning signs deserve prompt medical attention. These include severe or rapidly increasing pain, spreading redness, pus, fever, blackened skin, numbness, an open wound, or evidence that circulation is impaired. People with diabetes, known vascular disease, immune suppression, or other serious medical conditions should seek advice early. Emergency care is warranted for major COVID-19 symptoms such as difficulty breathing, persistent chest pain, confusion, or bluish discolouration of the face or lips. A person who may be infectious should also follow current public-health guidance concerning testing and contact with others.

The scientific significance of COVID toes extends beyond dermatology. Their emergence demonstrated how networks of clinicians and patients can quickly identify possible manifestations of a new disease. It also showed the limits of observation during a crisis. A sudden rise in reports can reveal a genuine biological phenomenon, but changes in behaviour, awareness, testing, and healthcare access can influence what is counted. Establishing causation requires consistent laboratory, pathological, and epidemiological evidence, not merely a memorable name.

In conclusion, COVID toes are chilblain-like lesions that became widely recognized during the pandemic, especially among younger people with mild or no other symptoms. A strong interferon response and inflammation of small blood vessels offer biologically credible explanations, yet negative tests and competing environmental factors leave important questions unresolved. Most cases are temporary and benign, but careful assessment is valuable when symptoms are severe or atypical. COVID toes remain a useful lesson in medical uncertainty: visible on the skin, scientifically intriguing, and best understood through balanced attention to both emerging evidence and alternative explanations.

Selected References

• Freeman, E. E., et al. “Pernio-like skin lesions associated with COVID-19: A case series of 318 patients from 8 countries.” Journal of the American Academy of Dermatology, 2020.
• Hubiche, T., et al. “Clinical, laboratory, and interferon-alpha response characteristics of patients with chilblain-like lesions during the COVID-19 pandemic.” JAMA Dermatology, 2021.
• American Academy of Dermatology Association. “COVID toes and other rashes COVID-19 may cause.”
• DermNet. “COVID toes and other skin manifestations of COVID-19.”

Painful corns are a common foot problem, particularly among people who wear tight shoes, spend long hours standing, or have toes and joints that rub against footwear. Because a corn may return after it has been filed down or removed, many people believe that it grows from a “root” buried deep in the foot. This is an understandable idea, since a corn often has a firm central core that can feel like a thorn pressing into the skin. Medically, however, corns do not have roots. They recur because the pressure or friction that caused the skin to thicken is still present.

A corn is a small, concentrated area of hardened skin. It develops as a protective response when repeated pressure or rubbing irritates one spot. The outer layer of the skin, called the epidermis, produces extra keratin and becomes thicker. This process is known as hyperkeratosis. Unlike a plant, a corn does not send a root into living tissue, and unlike a wart, it is not caused by a virus. The so-called root is actually a dense, cone-shaped core of compacted keratin. Its pointed end faces inward and may press on sensitive tissue, producing pain when a person walks or wears shoes.

There are several kinds of corns. Hard corns commonly form on the tops or outer sides of toes, where shoes exert pressure. Soft corns usually appear between toes, where moisture keeps the thickened skin pale and rubbery. Tiny “seed” corns may develop on the soles. Corns differ from calluses, which are generally broader, flatter areas of thickened skin. Both are caused by mechanical stress, but a corn’s smaller central core often makes it more sharply painful.

The belief in roots is reinforced by what happens after treatment. Filing, trimming, or using a medicated corn product may remove the visible thick skin and reduce pain. Yet the corn can return within weeks if the same shoe continues to squeeze the toe or if an underlying deformity keeps concentrating body weight in one place. The skin is responding normally to continuing stress: it rebuilds its protective layer. Therefore, recurrence does not mean that a root was left behind. It means the cause was not fully corrected.

Several factors can keep that cause active. Shoes with narrow toe boxes, high heels, stiff seams, or poor cushioning may repeatedly rub the foot. Bunions, hammertoes, prominent joints, and other changes in foot shape can create pressure points even in ordinary footwear. An unusual walking pattern may shift weight onto a small area of the sole. Loss of the natural fat padding under the feet, which can occur with age, may also increase pressure. In some cases, people develop corns because they do not wear socks, their socks bunch up, or their shoes are the wrong size.

Lasting treatment therefore focuses on relieving pressure as well as reducing the thickened skin. Wearing properly fitted shoes with enough width and depth for the toes is often the most important step. Cushioned socks, protective pads, toe sleeves, insoles, or prescribed orthotics may redistribute pressure. A podiatrist can safely pare down thick skin and assess whether a structural or walking problem is contributing. If a significant bunion or toe deformity repeatedly causes severe corns, corrective surgery may occasionally be considered, but most cases are managed without an operation.

Home care should be cautious. After soaking the foot in warm water, a person without circulation or sensation problems may gently use a pumice stone or foot file to reduce hard skin. The aim is gradual smoothing, not digging out a core. Corns should never be cut with a razor, knife, scissors, or other sharp object, because this can cause bleeding, infection, and lasting injury. Pulling at a corn is also unsafe. Moisturizers containing urea may soften thick skin, although product choice should be discussed with a pharmacist or clinician when medical conditions are present.

Over-the-counter corn plasters and liquids often contain salicylic acid, which dissolves keratin. These products can help selected healthy adults, but they may also burn normal skin if applied incorrectly. People with diabetes, poor circulation, reduced feeling in their feet, fragile skin, kidney disease associated with foot complications, or a history of ulcers should not self-treat a corn with acid or sharp instruments. They should seek professional foot care instead. Even a minor wound may be difficult for such individuals to detect or heal.

Correct identification matters because not every painful lump of hard skin is a corn. Plantar warts can resemble corns but are caused by human papillomavirus and may show tiny dark dots where small blood vessels have clotted. A splinter, cyst, ulcer, or other lesion can also be mistaken for one. A clinician should examine any growth that bleeds, changes rapidly, drains fluid, becomes red or swollen, causes intense pain, or does not improve when pressure is removed. Urgent advice is appropriate if there are signs of infection, such as spreading redness, warmth, pus, fever, or red streaks.

The outlook for ordinary corns is generally good. Once the pressure point is removed, the excess keratin can gradually wear away or be safely reduced, and the pain may disappear. Some feet, however, have permanent structural features that make pressure difficult to eliminate completely. In those cases, regular shoe adjustments, padding, podiatry visits, and careful skin maintenance may be needed. This is prevention and management, not an attempt to kill a hidden root.

Painful foot corns do not grow back from roots. The hard central plug is compressed keratin, not a living root, and it cannot regenerate independently. Corns return when repeated pressure or friction prompts the skin to protect itself again. Simply removing the surface thickening may provide temporary relief, but preventing recurrence requires attention to footwear, pressure distribution, foot shape, and walking mechanics. Safe treatment avoids cutting and treats the cause rather than chasing an imaginary root. Anyone with persistent pain, uncertain diagnosis, infection signs, diabetes, poor circulation, or reduced foot sensation should obtain advice from a doctor or podiatrist.

Cracked skin around the heel, often called a heel fissure, is a common problem that ranges from a rough cosmetic nuisance to a painful wound. The heel normally carries substantial pressure when a person stands or walks. If its skin becomes dry and thickened, that pressure can force the hardened rim of the heel to spread sideways and split. Small cracks may sting or catch on clothing, while deep fissures can bleed, become infected, and make walking difficult. Effective treatment therefore has three aims: restoring moisture, gently reducing excess hard skin, and limiting the pressure that repeatedly pulls the heel apart.

Dryness is the usual starting point, but several factors can contribute. Open-backed shoes allow the heel pad to expand, prolonged standing increases pressure, and cold weather, low humidity, hot showers, harsh soaps, and aging can reduce the skin’s natural oils. Obesity may increase the load on the heel. Eczema, psoriasis, athlete’s foot, diabetes, poor circulation, and an underactive thyroid can also cause or worsen cracking. Recognizing these influences matters because moisturizing alone may not solve a fungal infection, inflammatory skin condition, or medical problem.

For mild, uncomplicated cracks, treatment can begin at home. Wash the feet with lukewarm rather than hot water, using a gentle, fragrance-free cleanser if needed. Long soaking is best avoided because it may strip oils and leave the skin drier afterward. Pat the feet dry, especially between the toes. A short soak of about five to ten minutes can be useful immediately before removing thick skin, but the goal is to soften the surface rather than saturate it.

After this brief soak, gently rub the thickened heel with a pumice stone or foot file. Only loose, dead skin should be removed. Aggressive filing, razors, scissors, or so-called callus blades can cut living tissue, trigger bleeding, and introduce infection. Filing should stop if there is pain. People with diabetes, reduced sensation, poor circulation, immune suppression, or a history of foot ulcers should not treat calluses themselves unless a clinician has advised them how to do so safely. Professional foot care is the safer choice for these groups.

Moisturizer is the foundation of treatment. It should be applied at least twice daily and always soon after bathing, while the skin is still slightly damp. Thick ointments and heel balms generally work better than thin lotions. Products containing urea can both attract water and soften excessive keratin; concentrations around 10 to 25 percent are commonly used for dry, thick heel skin. Lactic acid, alpha-hydroxy acids, or salicylic acid may also help loosen scale, but they can sting in open fissures and should be used according to the label. Plain petroleum jelly is inexpensive, reduces water loss, and is often more comfortable when the skin is tender.

Nighttime care can intensify the effect. Apply a generous layer of heel balm or petroleum jelly, then put on clean cotton socks to keep the product in place and protect bedding. This routine may need to continue every night for one or two weeks before substantial improvement is visible. Once the skin has healed, regular moisturizing remains important because heel cracks commonly return when care stops. Cream should not be packed between the toes, where persistent moisture may encourage fungal growth.

A liquid, spray, or gel bandage may help protect a shallow crack, reduce pain, and hold its edges together. It should be used only on clean skin and exactly as directed. Household glue is not an appropriate substitute. Deep, dirty, bleeding, or infected wounds require assessment rather than cosmetic sealing. Conventional adhesive dressings can protect a tender area, although they need regular changing and should not trap excessive moisture. A clinician or podiatrist may use stronger skin adhesive, dressings, debridement, or other treatments for severe fissures.

Footwear is part of both treatment and prevention. Shoes with a closed, supportive heel counter reduce sideways expansion better than sandals, flip-flops, or backless slippers. Cushioned socks and properly fitted shoes lessen rubbing and pressure. Silicone heel cups or insoles may redistribute weight, although they should not make a shoe tight. Walking barefoot, particularly on hard floors, can aggravate the problem. If standing for long periods is unavoidable, changing position, taking seated breaks, and using supportive footwear can reduce stress on the heels.

Some apparent “dry skin” needs a different treatment. Itching, burning, scaling between the toes, or a powdery pattern across the sole may suggest athlete’s foot, which often requires an antifungal medicine. Red, sharply defined, or recurrent plaques may point to psoriasis or eczema. A health professional can distinguish these conditions and recommend an appropriate treatment; steroid creams, for example, can worsen an untreated fungal infection if used incorrectly. Persistent cracking may also justify checking for underlying illness or reviewing medicines and skin-care habits.

Medical help is important when a fissure is deep, very painful, repeatedly bleeding, or not improving after one or two weeks of careful home treatment. Increasing redness, warmth, swelling, pus, bad odor, red streaks, fever, or rapidly worsening pain can indicate infection and need prompt attention. Anyone with diabetes, neuropathy, poor circulation, kidney disease, immune suppression, or a previous foot ulcer should seek advice early, even for a small crack, because injury may be less noticeable and healing may be slower. Sudden discoloration, a cold foot, or severe pain warrants urgent care.

Prevention is usually simpler than repairing a deep split. Moisturizing the heels daily, filing thick skin gently and infrequently, choosing supportive closed-back shoes, and avoiding very hot water or harsh cleansers can preserve the skin barrier. Feet should be inspected regularly, particularly when sensation is reduced. Adequate hydration supports general health, but drinking extra water alone will not repair a damaged heel barrier; direct skin care and pressure control are still required.

Cracked heels improve most reliably through consistent, gentle treatment rather than forceful removal of hard skin. A brief wash or soak, cautious filing, a thick moisturizer, overnight occlusion with socks, and supportive footwear address the main causes while protecting the fissure as it closes. Because cracks can sometimes reflect infection or systemic disease, warning signs and personal risk factors should guide when professional care is sought. With patience and ongoing prevention, most uncomplicated heel fissures can heal and remain comfortable.

Cycling is often considered a low-impact activity because the bicycle supports body weight and protects the joints from repeated ground contact. Nevertheless, cyclists can experience a surprising range of foot problems. During every ride, the feet transfer muscular force through the pedals thousands of times while being confined inside relatively rigid shoes. Pressure, repetition, heat, swelling, poor bicycle fit, and unsuitable footwear can therefore produce pain, numbness, skin irritation, and overuse injuries. Understanding the most common problems, and the ways in which equipment and technique contribute to them, can help cyclists remain comfortable and avoid lasting injury.

One of the most familiar complaints is “hot foot,” a burning pain under the ball of the foot. It usually develops during longer rides as pressure builds around the heads of the metatarsal bones. Tight shoes, thin or poorly shaped insoles, rigid soles, high temperatures, and natural swelling can all aggravate the condition. A cleat positioned too far forward may concentrate force beneath a small area of the forefoot. Riders can often reduce symptoms by loosening shoe fastenings, choosing a wider toe box, using supportive insoles, or moving the cleats slightly backward.

Numbness and tingling are also common. These sensations may affect the toes or spread across the forefoot when shoes compress nerves or restrict circulation. Feet naturally swell during exercise, so footwear that feels comfortable at the beginning of a ride may become restrictive later. Thick socks, tightly pulled straps, and cold conditions can worsen the problem. Cleat position and excessive pressure over the forefoot may contribute as well. Recurrent numbness deserves medical assessment, particularly when it continues after cycling or occurs with weakness, colour changes, or symptoms elsewhere in the body.

A related but more specific disorder is Morton’s neuroma, in which tissue around a nerve between the toes becomes irritated and thickened. It commonly causes sharp or burning pain in the forefoot, sometimes accompanied by the feeling of standing on a pebble. Narrow cycling shoes and repeated compression can provoke or intensify symptoms. Wider footwear, metatarsal pads, appropriate insoles, and alterations to cleat placement may help by reducing pressure.

Cyclists may also develop plantar fasciitis, which involves irritation of the strong band of tissue running along the sole from the heel toward the toes. The typical symptom is heel or arch pain, often worst during the first steps after rest. Tight calf muscles, sudden increases in training, and excessive standing or running outside cycling may add to the strain. Gradual training progression, calf stretching, supportive footwear, and properly fitted insoles can assist recovery. Severe or continuing heel pain should be assessed to exclude other causes.

The Achilles tendon and the muscles around the foot and ankle can suffer overuse injuries too. Achilles tendinopathy usually causes pain and stiffness at the back of the ankle. A saddle that is too high may force the cyclist to point the toes and reach excessively at the bottom of each pedal stroke, increasing strain on the tendon. Riding large gears at a low cadence or increasing hill training abruptly can have a similar effect. Restoring training gradually, correcting bicycle fit, selecting manageable gears, and undertaking suitable strengthening exercises are central to prevention and rehabilitation.

The position of the cleats underneath cycling shoes has a major influence on foot comfort. Cleats placed too far forward can increase forefoot pressure, while those rotated incorrectly may force the feet, knees, and hips into unnatural alignment. A rider whose feet naturally angle slightly inward or outward should not necessarily have them locked into a perfectly straight position. Leg-length differences, unusual foot posture, or unstable arches may require wedges, shims, or customised support. Because changes in one area can affect the entire lower limb, complicated adjustments are best made by an experienced bicycle fitter or health professional.

Skin and nail problems are less dramatic but can still spoil a ride. Friction and moisture may cause blisters, particularly when socks bunch, seams rub, or shoes fit poorly. Breathable, well-fitting socks and dry footwear help, while small “hot spots” should be protected before they become blisters. Repeated contact at the front of a short shoe can bruise toenails, sometimes causing them to darken or detach. Warm, damp shoes can also encourage fungal infections such as athlete’s foot. Drying shoes thoroughly, changing socks, and maintaining good hygiene reduce this risk.

Cold weather introduces another concern: reduced circulation and, in severe exposure, frostbite. Wind passing over a cycling shoe can remove heat rapidly, while tight footwear leaves little insulating air and may restrict blood flow. Wool or technical socks, shoe covers, insulated winter shoes, and room to move the toes can offer protection. White or waxy skin, loss of sensation, or persistent pain after rewarming requires prompt medical attention.

Prevention ultimately depends on matching the bicycle and footwear to the individual rider. A careful fit should feel secure during the whole ride, without forcing the toes together or creating isolated pressure points in either shoe. Cycling shoes should be the correct shape and volume, not merely the usual numerical size. Fastenings should secure the heel without crushing the forefoot, and insoles should provide appropriate support rather than simply adding bulk. Cleats, saddle height, and riding technique should be reviewed whenever new pain appears. Training load should rise gradually, and cyclists should vary cadence, take breaks, keep shoes dry, and respond early to discomfort instead of treating numbness or burning as an unavoidable part of the sport.

Most cycling-related foot problems are manageable when their mechanical or environmental causes are identified promptly. However, pain that is severe, worsening, recurrent, or present away from the bicycle warrants professional evaluation. The same is true of lasting numbness, swelling, wounds, or changes in skin colour, especially for riders with diabetes or circulatory disease. With properly fitted equipment, sensible training, and timely care, the feet can perform their crucial role efficiently and comfortably. A cyclist may focus on the heart, lungs, and legs, but every successful pedal stroke ultimately depends on the small contact point inside each shoe.

The Cluffy Wedge is a small, commercially named plantar pad positioned beneath the hallux, or great toe. Developed by podiatrist James Clough, it is typically made from resilient polyurethane and slopes upward toward its distal end, holding the hallux in slight dorsiflexion; the larger commercial version is approximately 6 mm thick at its highest point.[1] It may be used as a stand-alone in-shoe pad or attached to the anterior extension or top cover of a functional foot orthosis. Its defining feature is therefore not an accommodation beneath the first metatarsal head but a sub-hallux dorsiflexion wedge. This distinction matters because the device is sometimes discussed alongside a kinetic wedge, first-ray cut-out, or reverse Morton’s extension. Those modifications unload or relatively plantarflex the first ray by supporting the lesser metatarsals differently and are not mechanically identical interventions.[1,2]

The clinical rationale for the Cluffy Wedge centres on first metatarsophalangeal (first MTP) joint dorsiflexion and the windlass mechanism. In the classic model, dorsiflexion of the toes tensions the plantar aponeurosis, drawing the calcaneus and metatarsal heads toward one another, elevating the medial longitudinal arch, and helping transform the foot into a stiffer propulsive lever.[3,4] By placing the hallux in modest dorsiflexion before late stance, the wedge is proposed to “pre-load” this system. In theory, it may reduce the additional dorsiflexion required at push-off, facilitate first-MTP motion, and encourage earlier or more effective windlass engagement.[1] Clough’s original article proposed this approach in the context of functional hallux limitus and overload of the lesser metatarsals.[5]

Functional hallux limitus is generally described as apparently adequate first-MTP dorsiflexion during a non-weight-bearing examination but insufficient dorsiflexion when the foot is loaded or during gait.[6] One proposed mechanism is that a dorsiflexed, or insufficiently plantarflexed, first ray increases resistance to hallux dorsiflexion during late stance. If the hallux cannot dorsiflex adequately as the heel rises, load may be shifted laterally to the lesser metatarsals or managed through compensatory gait patterns. The Cluffy Wedge seeks to alter the starting position of the hallux and first-MTP complex so that first-ray loading and hallux dorsiflexion can coexist more readily. This is a plausible mechanical hypothesis, but it should not be mistaken for a universally established explanation of forefoot pain, bunion progression, or symptoms elsewhere in the lower limb.

The windlass explanation itself requires nuance. Static toe dorsiflexion reliably raises the arch, but walking is more complex than a passive pulley model. In a three-dimensional study of healthy adults, toe dorsiflexion immediately elevated the arch in sitting and standing. During walking, however, the arch initially fell despite early push-off toe dorsiflexion and rose later in stance.[4] The authors concluded that static windlass observations poorly predict dynamic arch behaviour. Plantar-aponeurosis elasticity and intrinsic foot-muscle activity probably also contribute importantly to late-stance foot stiffness and arch rise.[4] Consequently, the claim that dorsiflexing the hallux with a pad predictably “switches on” a normal windlass mechanism during gait is stronger than current evidence supports.

A related body of orthotic research nevertheless supports the broader proposition that first-ray and first-MTP orthotic design can influence measurable mechanics. Scherer and colleagues studied 48 feet with functional hallux limitus using a custom semirigid orthosis fabricated with the first ray held plantarflexed during casting and a 4-mm medial heel skive.[7] In standing, mean maximum first-MTP dorsiflexion increased from 9.8° to 18.6°. In a 33-foot gait subgroup, peak sub-hallux pressure from heel-off to toe-off decreased by 14.8%.[7] This was not a trial of the Cluffy Wedge: the device, prescription, and combined modifications differed, and the small study involved authors affiliated with the supplying laboratory. Nevertheless, it offers indirect support for the proposition that selected orthotic approaches can change first-MTP mechanics in people classified as having functional hallux limitus.

More recently, a repeated-measures study of 30 asymptomatic adults examined a kinetic wedge, which supported metatarsals two through five while leaving the first metatarsal head free.[2] During a static hallux-dorsiflexion resistance test, the force required to dorsiflex the hallux fell from 19.6 ± 5.2 N while barefoot to 10.5 ± 3.2 N with the kinetic wedge, a statistically significant difference.[2] This finding is useful to the general concept of facilitating first-ray function, but it cannot establish that a Cluffy Wedge produces the same effect, that either device improves gait, or that either relieves symptoms in patients with functional hallux limitus, plantar heel pain, or metatarsalgia.

In practice, a clinician might consider a trial of a sub-hallux wedge when assessment suggests symptomatic functional hallux limitus with preserved passive first-MTP motion, a possible delayed windlass response, or lesser-metatarsal overload thought to be associated with impaired first-ray function.[1,5] It is best introduced as one component of an individualised plan that also considers footwear volume and sole stiffness, activity load, calf and ankle mobility, first-ray and rearfoot mechanics, symptom location, and progressive strengthening or rehabilitation where appropriate. The wedge can be attached beneath the hallux on a full-length orthosis or insole extension. Its thickness, length, material, and exact position should be adjusted for comfort and toe-box clearance. A short, reversible in-shoe trial with symptom and skin checks is more defensible than routine permanent incorporation.

The principal limitation is the lack of direct evidence. No peer-reviewed controlled clinical trials were identified that specifically tested the commercial Cluffy Wedge for pain, function, injury prevention, or long-term biomechanical outcomes.[1] The original Clough paper proposes a treatment method rather than reporting a randomised efficacy trial.[5] Small unpublished, thesis, conference, and promotional reports cannot resolve questions about patient selection, placebo effects, durability, adverse events, or comparative effectiveness. Nor should pressure redistribution alone be equated with a beneficial clinical outcome.

Contraindications and cautions follow from the design. A wedge that dorsiflexes the hallux is generally unsuitable when first-MTP dorsiflexion is structurally painful or unavailable, particularly in hallux rigidus or advanced first-MTP osteoarthritis; these presentations often require strategies that limit rather than encourage joint dorsiflexion.[1] Caution is also appropriate in acute first-MTP synovitis, gout, painful dorsal impingement, marked hallux skin or nail sensitivity, neuropathy or high ulceration risk, and footwear with inadequate toe-box depth. The pad can create dorsal nail or toe-box pressure and may increase local hallux pressure or irritation in some users.[1] New or worsening hallux, sesamoid, or plantar-fascial symptoms should prompt discontinuation and reassessment.

In conclusion, the Cluffy Wedge is a specific sub-hallux orthotic modification intended to place the hallux in slight dorsiflexion, with the aim of facilitating first-MTP function and, theoretically, windlass-related propulsion. It is most logically considered for carefully selected people with a functional rather than structural restriction of first-MTP motion. Its biomechanical rationale is credible but incomplete, and indirect studies of other orthotic designs do not prove its clinical effectiveness. Until direct, controlled, patient-centred trials are available, it should be presented as a monitored, individualised therapeutic experiment—not as a proven corrective treatment or performance-enhancing device.

References

1. PodiaPaedia. “Cluffy Wedge.” Clinical orthotic-design overview. https://podiapaedia.org/wiki/foot-orthotics/design-features/cluffy-wedge/

2. Gómez-Carrión Á, Sánchez-Gómez R, Reguera-Medina JM, et al. “Effect of using a kinetic wedge during the hallux dorsiflexion resistance test in asymptomatic individuals.” *BMC Musculoskeletal Disorders*. 2024;25:409. doi:10.1186/s12891-024-07520-z. https://pmc.ncbi.nlm.nih.gov/articles/PMC11118613/

3. Hicks JH. “The mechanics of the foot. II. The plantar aponeurosis and the arch.” *Journal of Anatomy*. 1954;88(1):25–30. https://pmc.ncbi.nlm.nih.gov/articles/PMC1244640/

4. Sichting F, Ebrecht F. “The rise of the longitudinal arch when sitting, standing, and walking: Contributions of the windlass mechanism.” *PLoS ONE*. 2021;16(4):e0249965. doi:10.1371/journal.pone.0249965. https://pmc.ncbi.nlm.nih.gov/articles/PMC8031382/

5. Clough JG. “Functional hallux limitus and lesser-metatarsal overload.” *Journal of the American Podiatric Medical Association*. 2005;95(6):593–601. doi:10.7547/0950593. https://pubmed.ncbi.nlm.nih.gov/16291854/

6. Sánchez-Gómez R, Becerro-de-Bengoa-Vallejo R, Losa-Iglesias ME, et al. “Reliability study of diagnostic tests for functional hallux limitus.” *Foot & Ankle International*. 2020;41(4):457–462. doi:10.1177/1071100719901116. https://pubmed.ncbi.nlm.nih.gov/31994419/

7. Scherer PR, Sanders J, Eldredge DE, Duffy SJ, Lee RY. “Effect of functional foot orthoses on first metatarsophalangeal joint dorsiflexion in stance and gait.” *Journal of the American Podiatric Medical Association*. 2006;96(6):474–481. doi:10.7547/0960474. https://doi.org/10.7547/0960474

Running is often treated as a simple act: place one foot in front of the other and repeat. Yet differences in posture, balance, cadence, and muscular tension can greatly affect how running feels. ChiRunning is a technique developed by ultramarathon runner Danny Dreyer that seeks to make running more efficient, comfortable, and mindful. Influenced by principles associated with tai chi, it emphasizes alignment, relaxation, controlled forward movement, and awareness of the body. Rather than asking runners to propel themselves mainly through muscular force, ChiRunning encourages them to cooperate with gravity and reduce unnecessary effort. Its central claim is not that running can become effortless, but that better organization of the body can prevent energy from being wasted.
The foundation of ChiRunning is posture. Runners are encouraged to lengthen the spine, level the pelvis, and align the shoulders, hips, and ankles. This creates what practitioners describe as a “column” through the body. Good alignment matters because a runner who bends at the waist, arches the lower back, or allows the head to project forward may place additional strain on muscles and joints. ChiRunning therefore begins with a stable core and a relaxed upper body. The arms remain bent and swing mainly toward the rear rather than crossing the torso. The shoulders, hands, jaw, and lower legs should stay as loose as possible. Relaxation is not merely a mental benefit; it is intended to reduce movements that consume energy without contributing to forward progress.
From this aligned position, the runner introduces a slight forward lean from the ankles. The body remains straight instead of folding at the hips. This lean shifts the centre of mass ahead of the feet, allowing gravity to assist forward motion. Speed is increased by leaning slightly more, while the legs respond by moving quickly enough to support the advancing body. The idea is sometimes compared to controlled falling, although the runner remains balanced and capable of adjusting pace. This feature distinguishes ChiRunning from styles that emphasize pushing forcefully from the toes or driving the knees high. Advocates argue that reducing active propulsion lessens fatigue in the calves and quadriceps.
Foot placement is another important element. ChiRunning generally encourages the foot to land beneath, or close to, the body’s centre of mass rather than far ahead of it. A long stride that lands well in front of the runner can act like a brake, creating impact and interrupting momentum. By shortening the stride and using a relatively quick cadence, the runner aims for quieter, lighter contact with the ground. ChiRunning often favours a midfoot landing, but the more important principle is avoiding an exaggerated reach and a forceful heel strike. The feet should lift behind the body as the legs relax, rather than being pushed off aggressively. Cadence may be supported with a metronome, particularly while a runner learns to separate turnover rate from stride length.
Mindfulness connects these mechanical principles. Practitioners use “body sensing” to notice tension, imbalance, breathing, and changes in form. They may focus on one feature at a time, such as relaxing the ankles or maintaining a level pelvis. This gradual process is important because changing several habits simultaneously can feel confusing and unnatural. ChiRunning also promotes rhythmic breathing and mental calm. In this respect, it treats running as a skill to be practised rather than a fitness test to be endured. Attention becomes a form of feedback: instead of ignoring discomfort, the runner asks what it might reveal about posture, workload, terrain, or fatigue.
The technique offers several potential benefits. Efficient alignment and reduced overstriding may improve running economy for some people, while a quicker cadence can reduce certain loads associated with long braking steps. Many runners also value the method because it gives them practical cues and makes easy running feel smoother. Its emphasis on gradual progress, relaxation, and self-observation can encourage consistency and enjoyment. Beginners may find that these ideas replace the vague instruction to “run naturally” with a structured way to explore movement. Experienced runners, meanwhile, may use individual ChiRunning principles to refine form during long distances, when fatigue tends to produce slumped posture and excessive tension.
Nevertheless, ChiRunning should not be viewed as a guaranteed way to prevent injury. Running injuries have many causes, including sudden increases in training, inadequate recovery, previous injury, limited strength, unsuitable footwear, and individual anatomy. Scientific research on changing running form is still evolving, and no single technique is ideal for every runner. Altering foot strike or cadence too quickly can transfer stress to unfamiliar tissues, particularly the calves, Achilles tendons, and feet. A runner who has used a pronounced heel strike for years may create a new problem by abruptly forcing a forefoot landing. The safest approach is gradual experimentation, guided by comfort and, where appropriate, advice from a qualified physiotherapist, sports physician, or running coach.
ChiRunning is best learned in stages. A runner might first practise posture while standing, then walk with a gentle ankle lean, and finally apply the same sensations during short, easy runs. Only one or two cues should be introduced at a time. Video analysis or coaching may reveal whether the apparent lean actually comes from the ankles or from bending at the waist. Strength work for the hips, calves, feet, and trunk remains valuable, as does sensible training progression. Technique cannot compensate indefinitely for excessive mileage, insufficient sleep, or persistent pain. If discomfort changes normal movement or worsens over time, rest and professional assessment are more appropriate than continued form correction.
Ultimately, ChiRunning presents running as a coordinated conversation between gravity, structure, movement, and attention. Its most useful lesson is that greater effort does not always produce better motion. By aligning the body, leaning gently from the ankles, shortening the stride, maintaining a quick rhythm, and releasing unnecessary tension, runners may discover a smoother and more sustainable style. The method’s claims should be approached thoughtfully rather than accepted as universal rules, but its emphasis on awareness has broad value. Whether adopted as a complete system or used as a collection of helpful cues, ChiRunning invites runners to move with patience, curiosity, and economy—qualities that can make the road ahead both kinder and more rewarding.