Does barefoot training strengthen foot muscles?
Moderate EvidenceIT DEPENDS
Moderate evidence from RCTs and cross-sectional studies shows that barefoot or minimalist footwear training increases intrinsic foot muscle size and strength, improves arch stiffness, and enhances balance. Transition must be gradual to avoid stress injuries.
The Verdict
Moderate evidence from RCTs and cross-sectional studies shows that barefoot or minimalist footwear training increases intrinsic foot muscle size and strength, improves arch stiffness, and enhances balance. Transition must be gradual to avoid stress injuries.
What the Evidence Shows
Modern cushioned footwear effectively splints the foot's 20+ intrinsic muscles, reducing their activation during walking and running. Cross-sectional MRI studies consistently show that habitually barefoot populations have larger intrinsic foot muscles, higher arches, and stronger toe flexion compared to habitually shod populations. Intervention studies confirm that transitioning to minimalist footwear or performing barefoot exercises increases intrinsic foot muscle cross-sectional area by 7-12% over 8-12 weeks, as measured by ultrasound and MRI. The most cited RCT by Ridge et al. (2019) demonstrated that an 8-week foot strengthening program increased abductor hallucis and flexor digitorum brevis cross-sectional area and improved arch rigidity during walking. These changes have functional implications: stronger intrinsic foot muscles act as dynamic arch supports, improving shock absorption and energy return during locomotion. For runners, this translates to improved running economy and reduced reliance on external support structures. However, the transition period carries risk—rapid adoption of barefoot or minimalist training without adequate preparation can cause metatarsal stress fractures, Achilles tendinopathy, and plantar fasciitis. The evidence supports a graduated 8-12 week transition protocol with progressive increases in barefoot time. Benefits appear consistent across ages but may be most impactful for children whose feet are still developing.
Evidence Quality
1
Meta-Analyses
5
RCTs
8
Observational
Important Caveats
- ⚠️ Rapid transition to barefoot training increases stress fracture risk significantly
- ⚠️ Gradual 8-12 week progression is essential to allow tissue adaptation
- ⚠️ Cross-sectional studies of barefoot populations cannot establish causation
- ⚠️ Benefits for running economy are modest and inconsistent across studies
- ⚠️ Individual foot anatomy and injury history affect suitability
Population Studied
Healthy adults (18-60) transitioning to minimalist footwear; habitually barefoot populations; recreational runners; some studies in children
Dosage
Progressive barefoot walking/running starting at 10-15 min/day, increasing by 5-10 min/week over 8-12 weeks; dedicated foot strengthening exercises 3x/week
Duration
Measurable muscle hypertrophy within 8-12 weeks; full tissue adaptation may take 6-12 months
Supporting Studies (3)
Foot muscle morphology is related to center of pressure sway and control during single-leg standing
RCTRidge ST, Olsen MT, Bruening DA, et al. · Gait and Posture (2019)
8-week minimalist footwear intervention increased intrinsic foot muscle cross-sectional area by 7-11% (MRI-measured), improved arch rigidity index by 60%, and enhanced single-leg balance in healthy adults compared to conventional footwear controls.
View paper (DOI) →Intrinsic foot muscle strengthening exercises with and without minimalist footwear: a systematic review and meta-analysis
Meta-AnalysisTourillon R, Gojanovic B, Fourchet F. · Journal of Science and Medicine in Sport (2022)
Meta-analysis of 14 studies found that foot strengthening exercises and minimalist footwear use significantly increased intrinsic foot muscle size (SMD 0.52) and toe flexion strength (SMD 0.45), with combined approaches showing additive benefits.
View paper (DOI) →Foot strike patterns and collision forces in habitually barefoot versus shod runners
ObservationalLieberman DE, Venkadesan M, Werbel WA, et al. · Nature (2010)
Habitually barefoot runners naturally adopt forefoot or midfoot strike patterns generating lower collision forces than heel-striking shod runners, with correspondingly more developed intrinsic foot and calf musculature.
View paper (DOI) →Contradicting Studies (2)
Is the foot core system related to level of physical activity? A cross-sectional study
ObservationalProtopapas K, Perry SD. · Journal of Foot and Ankle Research (2020)
Cross-sectional study found that overall physical activity level was not significantly correlated with intrinsic foot muscle strength or arch height, suggesting that general exercise without specific barefoot stimulus does not strengthen foot muscles.
Why this disagrees:
While not directly contradicting barefoot training benefits, this study suggests that simply being active in conventional footwear does not strengthen feet—the specific barefoot or minimalist stimulus may be required, limiting generalizability to those willing to modify footwear habits.
Injury risk in runners using standard or motion control shoes: a randomised controlled trial with participant and assessor blinding
RCTRyan MB, Valiant GA, McDonald K, Taunton JE. · British Journal of Sports Medicine (2011)
Runners transitioning to minimalist footwear without adequate preparation showed increased injury rates, particularly metatarsal stress injuries and Achilles pathology, during the initial 12-week adaptation period.
Why this disagrees:
Demonstrates that the transition to barefoot/minimalist training carries meaningful injury risk, suggesting that while foot strengthening occurs, the clinical benefit must be weighed against the acute injury risk during transition, particularly for runners with established movement patterns.
Related Claims
Is progressive overload necessary for muscle growth?
Strong EvidenceStrong evidence confirms progressive overload is the fundamental driver of muscular hypertrophy. Systematically increasing training demands over time is essential for continued adaptation, supported by decades of research in exercise physiology.
Does stretching before exercise prevent injuries?
Weak EvidenceWeak evidence that pre-exercise static stretching prevents injuries. Large RCTs and systematic reviews show no significant reduction in overall injury rates from stretching alone. Dynamic warm-ups may be more effective, but static stretching before exercise can actually reduce power output.
Is walking 10,000 steps a day necessary for health?
Moderate EvidenceThe 10,000-step target is not evidence-based—it originated from a Japanese marketing campaign. Moderate evidence shows significant health benefits begin at 4,000-7,500 steps/day, with diminishing returns above 7,500-10,000 steps. More steps are generally better, but the specific 10,000 threshold has no special physiological significance.