From the point of view of health care, it is not scientific to work out at night. The yin and yang of the human body changes according to the seasons and the sun’s rise and fall in the morning and evening of the day. Yang energy rises gradually in the morning and is most vigorous at noon, while it gradually decreases and weakens in the evening and enters the inner organs of the body. And this time is the yin energy is strong, so at this time the human body is in need of rest, is in need of rest and recuperation. So if you often exercise at night, want to enhance the body’s physical fitness through the night time, then it is not scientific, day long will deplete the body’s yang, then instead of the effect of exercise, and will hurt the body. Generally at night, we can do some meditation, or some indoor yoga to nourish our spiritual energy, to nourish our essence, which is more scientific and reasonable. But for some physical exercise, we should put it in the morning or noon to exercise.