Services-San khlakPhysical fitness refers to the ability of the body (physical ability) that are composed of heavy activity (intensive activity) is a long (long period) without being and. (High quality), for example, the two men began to cut a tree in the same manner. When it turns out that time. The first man to have 10 pieces cut, exhaustive request stop at the same time, the second man to be cut again, and stop when the next cut. 20 pieces in relation to both these men know that a second man with better physical fitness first (wichai. Robin durong Wan: 2535 (1992).)
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