Alternating hot and cold water bath can make blood vessel contraction, diastole, play the role of improving atherosclerosis, eliminate fatigue, enhance male sexual function. 1. Atherosclerosis: alternating hot and cold water bath, so that vascular contraction, diastole, can increase the elasticity of blood vessels and tolerance, so that the atherosclerotic plaque deposited in the blood vessel wall, with the blood perfusion discharge, play a role in preventing atherosclerosis. 2. Clear fatigue: adhere to the daily alternating hot and cold water bath, so that the blood vessels repeatedly dilate and contract, promote blood circulation, can repair the muscles and nerves, so that the rest, alternating hot and cold water bath has a health care effect, can make the energetic, fatigue reduction. 3. Enhance male sexual function: alternating hot and cold water bath has the role of assisting to improve male sexual function, after soaking the body, with cold water will be the scrotum part of the penis rinse, scrotum penis contraction, and then into the hot water pool, repeat about three times, the penis and groin using stimulation, enhance sexual function. The use of alternating hot and cold water baths should be carried out under the guidance of professionals to avoid harm to the body.