China culture is extensive and profound. From a small point of view, the human body and even everything in the world are composed of yin and yang. It has been confirmed that there is dark matter in the world, and Yin and Yang are equivalent to light and dark matter. China's Tai Chi is also the embodiment of Yin and Yang. Exercise is a manifestation of consuming yang in health preservation, while quietness is a way to stick to yang and resist yin. In terms of health, the time of movement is very particular. Dynamic and static combination is to stabilize the balance of yin and yang in the body. When the yang is too strong, you need to rest Pingyang. When the yang in the body is weak and the yin is excessive, it is necessary to move to supplement the yang. This is my own understanding. Traditional health preservation is too abstruse, and exercise is closely related to my own spirit. You can read China's traditional health books by yourself. Although some traditional theories of Yin and Yang have not been confirmed, there are some things you have to believe.