(1.School of Physical Education,Nanjing Normal University,Nanjing 210023,China;2.School of Economy and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) Abstract: From the dual perspective of the theory with social network and knowledge transfer, a theoretical framework on the mechanism of physical exercise behaviour has been established, which is verified by empirical research and then obtains the enlightenment on the further promotion of national fitness. It is found that the reason why physical exercise behaviour shows a unique "inertia" and "preference" is that the social networks formed by physical exercisers in the interaction brings people physical exercise information sharing and exchange, and shapes people's decision preferences for physical exercise behaviour, and even their values. Physical exercise groups are usually low-density social networks, and the higher density of emotional networks means the higher trust among members, which would be more conducive to the knowledge transfer of physical exercise. The knowledge transfer of physical exercise is relatively rely on a few nodes. The core members of physical exercisers during knowledge transfer, especially coaches or heads of sports clubs, play an important role as knowledge communicators; and now members' access to physical exercise knowledge increasingly depends on informal, open and networked methods. Keywords: national fitness;social networks;physical exercise behaviour;knowledge transfer
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