This belongs to health care equipment, and its function is limited. That is, under normal circumstances, it can help muscles in some parts relax (exercise will generally cause some damage to muscle fibers, so long as nutrition is guaranteed, it will repair itself, and the strength will be stronger after recovery), and proper use can shorten the recovery time. If it has been seriously damaged, it is generally not recommended. For example, just like monosodium glutamate, put a little, it feels good; It's not that bad not to let go. More often it is decided by personal habits.