Traditional Chinese medicine has a systematic understanding of the physiological process of human aging, which can be traced back to Huangdi Neijing. It studies the aging cycle of human body with men and women as units, and points out that the rise and fall of kidney qi is closely related to growth and aging. Su Wengu's Theory of Naivety states: "The woman is seven years old, full of kidney qi and has longer teeth. On the 27 th, the pulse passed, the pulse was too strong, the moon was in the present, and there was a son. Sanqi kidney qi is general, so real teeth are born and grow. Forty-seven strong bones and muscles, extremely long hair and strong body. On May 7th, Yangming pulse failed, the face began to burn and the hair began to fall off. The 673 Yang pulse decays in the upper part, the face is burnt, and the hair begins to turn white. On July 7, the pulse was weak, the pulse was too strong, the sky was exhausted, and the tunnel was impassable, so the shape was bad and there was no child. My husband is eight years old, with strong kidneys and long teeth. 28. The kidney is full of qi, the sky is full, the essence overflows, and the yin and yang are harmonious, so you can have children. Kidney qi is general, and bones and muscles are strong, so real teeth are born and grow. Four or eight strong bones and muscles. 58 kidney failure, tooth loss. 68 upper body yang deficiency, burning face and white hair. Seven or eight liver qi fails and muscles can't move. Eight or eight days of exhaustion, lack of sperm, renal failure, and particularly good figure. Then the teeth are gone. " (27 refers to 14 years old, 58 refers to 40 years old, and so on). It can be seen that renal function is closely related to human aging. The kidney is the congenital foundation, which connects the two yin (anterior yin and anus) and is responsible for the reproductive system. Both Chinese and western medicine believe that human aging is closely related to the functional decline of reproductive system and urinary system. The important organs and endocrine glands of urogenital system are located in abdominal cavity. Mr. Ma Litang, a famous martial artist and an old Chinese doctor, introduced "heel breathing" into six-character tactics. When the six-character formula adopts abdominal breathing, it naturally closes the abdomen, lifts the anus and contracts the kidney, which is a massage and exercise for these organs, promotes the vigorous blood circulation of these organs, strengthens metabolism and eliminates the waste in organ function activities. Long-term exercise can prevent the function of these organs from rapidly declining due to old age, or even aging before old age, thus achieving the effect of prolonging life. In the exercise of contracting abdomen, anus and kidney with six-character formula, it also strengthens the movement of kidney, promotes the secretion of adrenaline and can improve people's immunity. At the same time, it can make the front and back yin that can't exercise at ordinary times move, which is very effective for eliminating the disease of two yin. It can be used to treat prostatic hyperplasia, hysteromyoma, infertility, hemorrhoids, irregular menstruation, etc. Of course, the six-character formula also includes other contents, not just mentioning two yin, so I won't go into details here. Abdominal contraction occurs naturally with breathing and reading, and it is not consciously controlled.