Soreness on the second day of swimming is mainly caused by muscle secretion of creatine and lactic acid, which can be relieved by rest, appropriate massage, local hot compresses and other methods. 1. Attention to rest: the second day of swimming sore, need to pay attention to rest, avoid limb joints activities, to avoid aggravation of soreness, and make the creatine and lactic acid metabolism gradually. 2. Appropriate massage: Appropriate massage can be used to promote local blood circulation, promote the metabolism of creatine, lactic acid and other substances and discharge, so as to play a role in relieving body aches and pains. 3. Local hot compresses: local hot compresses can also promote local blood circulation, accelerate the discharge of metabolic products, thus playing a role in alleviating the symptoms of the second day of swimming body aches and pains. If the soreness on the second day of swimming is not relieved for a long time, it is recommended to consult a professional doctor for scientific treatment, to avoid improper treatment of the body to cause harm.