Yes According to research, not all people are suitable for alternating hot and cold baths. Cold water bath means bathing with cold water between 10 ~ 20℃, which can promote skin metabolism and enhance skin nutrition. People who insist on cold water bath for a long time have tender, ruddy and elastic skin, showing the beauty of health. In cold water bath, blood vessels will push a lot of blood into visceral vessels, and after a pause, skin vessels will expand again, and a lot of blood will flow from visceral vessels to the body surface, thus improving the endurance and elasticity of blood vessels and helping to prevent arteriosclerosis. In addition, cold water bath can also enhance the functions of respiratory organs and digestive organs, and play a positive role in preventing diseases such as upper respiratory tract infection, rheumatism and arthritis. The cold water bath should adopt a step-by-step method. Don't use very cold water at once, the water temperature can gradually drop to not less than 10℃, so that the body can have an adaptation process; It can start in summer and last until winter, all the year round. It is best to choose in the morning, which will help to eliminate the inhibition after sleep and make people feel refreshed. You can also choose noon, which is generally not suitable at night. The washing time should not be too long, from tens of seconds to several minutes. You can take the method from local to whole body, that is, wash your face and soak your feet first, then take a bath and shower all over your body. You can also go swimming in winter if you are in good health. A cold bath is not for everyone. Some people's skin is sensitive to cold water, which will produce urticaria, hematuria and purple spots; Patients with severe hypertension, coronary heart disease, acute hepatitis, cavitary tuberculosis, active rheumatism, sciatica, joint pain and high fever are not suitable for cold bath! ! The order of hot and cold is as follows: the alternating hot and cold bath for strengthening the body starts with a hot water bath, the temperature of hot water is about 38℃ ~ 44℃, and the washing time is about 4 ~ 6 minutes; Then take a cold shower, the warm water of cold water is between 10 ~ 16℃ for about 1 ~ 2 minutes, and finally take a hot bath. There is no limit to the number of times you can alternate, generally it can be two or three times. Alternating hot and cold bathing can eliminate the physical and psychological pressure of the weak or those who are afraid of cold, and determine the length and frequency of cold bath time according to their physical condition. They can switch to hot water bath at any time, so that the body can warm up quickly, and the exercise value is greater than that of simple cold water bath. Hehe, that's all I know.