There is also Sun Simiao's Thirteen Laws of Health Preservation, which has been passed down to later generations: First, the hair is often combed; Second, the eyes are always moving; Third, teeth often knock; Fourth, Shu; Fifth, ears often bulge; Sixth, wash your face often; Seven, the head often shakes; Eight, the waist is often put; Nine, the abdomen is often rubbed; X. Photos of Gu Dao; Eleven, the knee is often twisted; Twelve, often take a walk; Thirteen, often rub your feet.