Late summer and early autumn is a good time to take a cold bath, so the physiological activities of various systems of the body are at the lowest stage, and cold stimulation helps to eliminate the inhibition of sleep. It can be carried out according to the principle that the lower the water temperature, the shorter the duration and the gradual increase.

It is best to arrange cold water exercise in the morning, and the time to start exercise is 1 ~ 2 minutes, and gradually increase to 10 ~ 15 minutes. Or combined with jogging, do jogging first, rest for 5 ~ 10 minutes after running (depending on the season, the amount of long-distance running activity and body sweating), and then take a cold bath. The temperature of water should be determined according to the individual's tolerance. Generally, it starts with warm water, and the water temperature drops by 65438 0℃ every 3 ~ 5 days. Old people, after systematic cold water exercise, the water temperature can be reduced to 14℃ ~ 15℃.