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30 minutes at a time in training. BI_Physcial fitness Physical fitness is the ability of the human body to function with vigor and alertness, without undue fatigue, and with ample energy to engage in leisure activities, and to meet physical stresses. Physical Fitness The level of physical fitness can be influenced by regular, systematic exercise. Exercises that demand total body involvement improve and maintain fitness most effectively-for example, jogging, running, swimming, vigorous dancing, cycling, and brisk walking. Normal, healthy individuals may plan their own........