The changes of human morphology and composition after human being can walk with his legs are the base of man's physical activity of sport.
人类在进化为直立行走后，所发生的人体形态结构的变化，为体育性质的身体活动奠定了生物学的基础。
The training of obstacle-surmounting in the police physical education is a kind of sport activity in accordance with the need of the police career and the physical and mental quality of the policemen.
警体越障训练是根据警察职业和警察身心素质的需要而开展起来的一种特殊的体育活动。
The result showed that the main factors influencing their physical activity were attitude and motivation. The external factors were shortage of sport venues and equipment and big employment pressure.
研究结果表明：影响大学生课余体育锻炼的主观因素主要有大学生对课余体育的认知态度与动机，客观因素主要有场地器材不足、网络中花费时间较多、就业压力等。
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