在体育运动中,运动员要作各种绕人体某一轴转动的动作。如前后空翻、侧空翻,及绕纵轴旋转等,有团身、屈腿、屈体、分腿、直体等。这种不同姿势下动作完成之难易,与人体对此种转动轴之转动惯量的大小是有直接的关系。人的身材比例各不相同,所以转动惯量即使在同一姿势也是因人而异的。对体育科学的研究,随着科学的发展,也将由定性的、凭经验 In sports, athletes need to make a variety of movements around a certain axis of the human body. Such as before and after the flop, side flip, and around the vertical axis rotation, a group of body, bent leg, pike, leg, straight and so on. The difficulty of completing the action under such different posture is directly related to the body’s inertia on the rotational axis of such a rotating shaft. Human body proportions vary, so moment of inertia can vary from person to person in the same position. The study of sports science, with the development of science, will also be qualitative and empirical