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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.
As with supination, when pronation is excessive it is referred to as overpronation. Pronation occurs as the foot strikes the ground and rolls in to absorb the impact. Supination occurs as the foot prepares to toe-off to provide a rigid platform for leverage. As the foot rolls out it becomes a rigid lever.