The muscle soreness that occurs after exercise is mainly caused by the repeated stretching of muscle parts in the process of exercise, causing myocyte edema and lactic acid accumulation, which will result in reduced muscle cell relaxation and soreness. So after the exercise soreness, you can first apply ice or cold towels to avoid the aggravation of myocyte edema and soreness and to avoid the symptoms of muscle strain later. Then after 24 hours of exercise, you can properly apply heat to the muscles to promote local blood circulation, thus promoting the complete decreasing of myocyte edema and recovery of soreness.