After fitness, such as arm soreness, is usually caused by the following reasons: First, too much force or when not sufficiently warmed up, fitness will hurt the bone, fascia, ligaments and other joints, resulting in joint avulsion and joint trauma, stretching and other conditions. Second, excessive rhabdomyolysis after fitness will release a large amount of creatine kinase into the blood, which will also lead to arm pain and soreness. Third, too much anaerobic exercise training will produce a large amount of anaerobic glycolysis, which will cause glycogen to be rapidly released and absorbed into the body, metabolizing too much lactic acid, and when too much lactic acid accumulates in the body and in excess, arm soreness and soreness will occur. At this time, there is no need to be overly and excessively nervous, and treatment at the hospital can relieve the arm soreness after working out.