Plantar Fasciosis Technique (1) In a perfect walking stride, the arch elevator muscles (tibialis anterior, peroneus longus and tibialis posterior) work in perfect harmony with the plantar-flexors (gastroc, soleus, etc.) to absorb, distribute and release stored kinetic energy. On heel strike, the arch elevators must fire eccentrically to decelerate and dissipate ground reaction forces via foot pronation and internal tibial rotation. As the foot transitions from midstance into push-off, the toes b