From a scientific point of view, hot compress and cold compress are not recommended, because muscle soreness after exercise is due to lactic acid produced by muscles during exercise. Hot compress can promote lactic acid decomposition and promote blood circulation, so cold compress will slow blood circulation, so it is hot compress! In addition, as a reminder, you should relax and pat your muscles when doing muscle stretching. For example, abdominal muscles can twist the waist and back, and the stretching exercise should not be too fierce. Muscles should be adjusted step by step. If you do some intense muscle exercise, you will cause muscle strain because of muscle discomfort.