According to the meridian theory of Chinese medicine, the internal organs of the human body have corresponding acupuncture points on the feet. The soles of the feet are the convergence points where the meridians start and end. Many acupuncture points are gathered between the insteps, soles, and toes; some scientists also believe that the feet are the second heart of the human body. Numerous nerve endings are connected to the brain on the soles of the feet. It is the "health-care zone" of the human body. It fully develops the health-care potential of this "special zone" and has certain benefits for the prevention of certain diseases.