What is pronation and supination?

 The foot is a biomechanical marvel. 26 bones and 31 joints, working together in concert to provide balance, stability, and locomotion. As we walk or run, the foot is supposed to go through a series of biomechanical changes, so that it can either adapt to the environment or become a rigid lever for propulsion. When these mechanisms fail, problems usually arise. When the heel hits the ground, the arch of the foot is supposed to partially collapse (pronation), so that the foot can adapt to the ground; in this position, it is flexible and “unlocked”. After the weight of the body passes over the foot, the arch is supposed to retract, and the foot becomes more rigid or “locked” (supination), so that you can use it to propel yourself forward. If the foot remains in pronation for too long, or does not supinate correctly, problems will develop over time.