Exercise at night will not damage yang qi if done properly, but excessive exercise will damage yang qi. In traditional Chinese medicine theory of time, the evening is the time of yang qi astringent, should be indoors lying down in order to raise the body’s yang qi. However, today’s people and the ancients work and rest rules are not consistent, if in the evening after dinner proper exercise, is not caused by yang qi damage, on the contrary, this time the proper exercise, so that yang qi running the whole body, better and yin qi intersections, to help the human body sleep. But if the exercise is too much, or exercise time is too late, it is harmful to yang qi, can not better make yin and yang intersection, affecting the night sleep, can not make yang qi to hide, more damage to yang qi. In short, the appropriate time at night, appropriate exercise, is conducive to human health, generally will not damage the yang qi.