There is no specific time limit for running in general, and the best time for running is recommended to be 8:00-12:00 in the morning and 14:00-18:00 in the afternoon. Usually 8:00-12:00 in the morning or 2 hours after breakfast, the food consumed at breakfast has been basically digested, which can improve the energy needed for exercise and will not cause poor digestion, and at this time the sun has risen, the air is fresh and the oxygen content is high. It is the golden moment to exercise. 14:00-18:00 pm is the time when the bladder meridian is active, and the hydration phenomenon caused by running at this time is conducive to body detoxification. After half a day of daily work, muscles and ligaments have been fully active, heart rate and blood pressure are in a stable state, and the amount of exercise that the body can bear is higher than other times. In addition, in any time running, should pay attention to fully warm up before exercise, do a good job of relaxation and stretching exercises to avoid injury.