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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.
The problem with underpronation â or supination â is that the foot is not in the right position to allow for optimum weight distribution, and the structures of the foot which help with the cushioning of shocks (the foot arches and plantar fascia) cannot work efficiently.nderpronation can be caused by structural abnormalities in the feet or when previous injuries to the feet have damaged the tendons and muscles, or when there is muscle imbalance or a particularly tight Achilles tendon.