It means that from 9: 00 am to 1 1 pm, every 15 minutes is a "moment", which is the most vigorous time of human yang, and is very suitable for health preservation. Shenshi refers to the time between 9: 00 am and 1 1 in the solar calendar, that is, Shenshi in the lunar calendar. Four quarters means that the bidding period is divided into four small periods, each lasting 15 minutes. In the theory of traditional Chinese medicine, the human body can be divided into yin and yang, which need to be balanced to keep healthy. At this time, health care can replenish yang, enhance the vitality of human yang, and improve human immunity and disease resistance.