People's activities are influenced by biological clock, and it is most beneficial for the body to arrange activities according to biological clock. It is often said that the best time for exercise is 5-6 pm, because at this time, the human body is more excited and the muscles are easily mobilized. Winter is different, usually in the afternoon 14- 16, which is a good opportunity to strengthen physical strength, and muscle endurance is 50% higher than other times. 17- 19, the human body's exercise ability reaches its peak, the heart rate and blood pressure rise, and the audio-visual performance is the best.