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...numbers, it is not surprising that aerobics instructors replaced gymnasts as the athletes with the highest incidence of sports injuries. An estimated 75 percent of aerobics instructors have sustained at least one musculoskeletal injury while teaching aerobics classes. Of the three major lower extremity joints (i.e., hip, knee and ankle), the knee may be the most susceptible to injury during repetitive movement exercises. Since the knee joint only has flexion and extension ranges...
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