The direction of the twelve tendons is the same as that of the twelve meridians, so the meridians contracted by the tendons are also impassable, which hurts. In the process of lacing, there will be pain in the crotch, inner thigh and popliteal fossa, indicating that these parts contract and the corresponding meridians are not smooth. Stretch tendons and soften tendons, restore dislocation on the spine, make "normal bones and soft muscles, blood flow downstream", and eliminate and slow down pain, numbness and swelling in waist, knees, limbs and all parts of the body;
Lack of tendons can open the Du meridian and bladder meridian in the back, which is of great significance to health, because Du meridian is the meeting of yang and the meridian of vitality. This meridian generally strengthens renal function, and the kidney is the innate foundation and the source of essence. People's energy and sexual ability depend on the strength of kidney function. The du meridian is on the spine, and the spinal cord goes directly to the brain marrow, so the spine is inextricably linked with brain diseases. The second pulse of Ren Du is a circle in the human body, which means that the second pulse of Ren Du should be opened in various ways. Bladder meridian is the largest detoxification system of human body and an important barrier against cold. If the bladder channels and collaterals are unobstructed, the wind and cold are difficult to invade, and the toxins in the body are discharged at any time, then the symptoms such as obesity, constipation, acne and pigmentation will naturally be eliminated and alleviated. The bladder meridian is also the Shu point of the zang-fu organs, that is, every point with the same name as the zang-fu organs on both sides of the spine. Clearing the bladder meridian is naturally beneficial to all the zang-fu organs. According to the theory of western medicine, the main nerves and blood vessels connecting the brain and internal organs are attached to the spine and bones on both sides. Dredging the spine up and down naturally removes many visible fortresses, obstacles and invisible mines and traps.