Exercise increases the flow power of blood and body fluids, which helps to activate impurities deposited and adsorbed in human body, re-enter blood and body fluids, and move to their respective exits with the flow of blood and body fluids to complete their unfinished journey and achieve the purpose of cleaning the body; At the same time, it can make all parts of the body get and use enough nutrition better. From this perspective, exercise is really good for health.