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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.
In most instances, the real cause of the problem (and/or over pronation) is the inefficient protective reflex mechanics that have been conditioned by cushioned, supportive, and restrictive footwear, and further exacerbated by rigid soles, heel height, and heel flare.