In the flourishing society, aerobics as a sport event that can build one’s body and cultivate one’s taste, is popular among ordinary people, but due to professional knowledge deficiency, mass may unconsciously generate injuries in body when taking aerobics exercise, in order to reduce occurrence rate of such injuries, the paper firstly gets dynamics relations and arms rotational inertia when aerobics athletes exercise upper limb inward and outward rotation motion by researching, gets that aerobics athletes’arms potential energy size when exercise upper limb inward and outward...