After fitness the next day muscle soreness generally can continue to exercise, but need to pay attention to exercise intensity and exercise. When the patient fitness time is too long, aerobic respiration can not meet the body’s energy requirements when the organization will carry out anaerobic respiration, producing a large amount of lactic acid, when lactic acid accumulation in the body and can not be metabolized will cause muscle soreness symptoms. After fitness muscle soreness need to stop anaerobic exercise, low-intensity aerobic respiration, through exercise to accelerate blood circulation, increase the respiratory rate, improve muscle hypoxia, accelerate the lactic acid metabolism, so as to improve muscle soreness. The next day after the bodybuilding muscle soreness can be appropriate to carry out low-intensity exercise, if the pain is severe, it is recommended to go to the hospital in a timely manner to avoid delays in the condition.