Water bath can be divided into hot bath and cold bath. Common are rubbing, showering, bathing and swimming. Choose different methods according to different ages, seasons and personal physique. Water bath can not only clean the skin, but also coordinate nerve activity, promote blood circulation, relax muscles and activate collaterals. Water baths with different temperatures can regulate cardiovascular function and effectively prevent and treat diseases such as hypertension, hypotension, hyperacidity and diabetes.