Washing marrow is a method of keeping fit and prolonging life. It is a health-keeping method that does not rely on any drugs or supplements, and enhances physical fitness through self-exercise. Easy tendon-easy to change, tendon is warp tendon, which means changing the warp tendon of human body through practice to make it firm and smooth. Wash the marrow-washing the marrow means cleaning, and the marrow is the bone marrow, which means that you can wash the bone marrow through practice to remove impurities and toxins from the bone marrow.