1, insufficient strength. In order to relieve the muscle stiffness after exercise, you can use a mace roller to relax the muscles, but you need to roll them with appropriate strength to force the muscles. If the strength is not enough, it will be in vain.

2, the posture is wrong, when relaxing muscles, you need to let the muscles be in a relaxed state, that is, a state of no force and no stretching. If the posture is wrong, the muscles are stretched and cannot be relaxed.