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The way your feet land when you run can cause serious injuries. Photo Credit iStock/Halfpoint. Underpronation, also known as supination, is a foot-positioning problem encountered by runners and other athletes who run during their sport.
Definition. Over-pronation, or flat feet, is a common biomechanical problem that occurs in the walking process when a person's arch collapses upon weight bearing. This motion can cause extreme stress or inflammation on the plantar fascia, potentially causing severe discomfort and leading to other foot problems.