Because the whole body relaxes, the weight above the waist naturally sinks and is borne by the waist, so the waist must be vertical to be strong and straight, and the shoulders in labor and weightlifting in sports need to be straight to play a role and avoid injury.

In order to make the waist loose, heavy and straight, it is necessary to have the cooperation of loosening the hips and bending the knees, because the forward bend of the knee joint can replace the waist bend. Taiji said, "If there is an evil opportunity, you must ask for it from the waist and legs."

Six methods of Tai Chi:

(1) Forehand fist (tiger's mouth up). (2) backhand (tiger's mouth facing down). (3) Standing fist (the top of the fist is upward or obliquely upward). (4) planting a fist (the top of the fist is downward). (5) Punch up (heart up, back down). (6) prone fist (fist heart down, fist back up).

Hook-hand: Finger drooping or leaning backward and downward is a kind of grasping method in technical attack, which plays the role of grasping, grasping, locking and buckling, and is not limited to holding the opponent's joints, but developed into taking the opponent's strength. Wrists and fingertips should have the ability to grasp, take, row and entangle, the ability to lift, stop, stick and empty on body steps, and the tactics of "grasping hard and breaking soft"

Trunk, "chest-containing", "abdomen is solid and chest is wide", six boxing methods of Tai Chi, exercise, fitness, Tai Ji Chuan posture and movements, all the techniques (that is, walking) that need to be used are inseparable from the assistance of chest-containing. I'm not used to holding my chest when I practice boxing for the first time. First, I completely give up the idea of holding my chest, and slowly hold my chest slightly in the sitting action to avoid concave chest (hunchback) and chest disease.

"Pull-back" means that when the chest slightly contains the chest, the muscles of the back relax downward, while the middle ridge (the third spine of the lower cervical vertebra) between the shoulders bulges upward, and is slightly pulled upward to make the muscles of the back have certain tension and elasticity, and the skin feels tight. Therefore, there is a saying in boxing that "strength comes from the spine", which is actually the joint action of the muscles of the shoulder and back.

The inner strength starts from the heel, runs through the back and shapes at the fingers. "The back comes first", and the boxing theory says: "The chest pulls the back naturally", telling us that the chest and back muscles should be relaxed, not forced, not deliberately forced. "Back-pull" and "chest-containing", the chest-containing function is beneficial to strength, and the back-pull function is beneficial to rolling strength and releasing strength.

"Qi Shen Dan Tian", Tai Chi six methods, exercise, fitness, Tai Ji Chuan parts, movements, abdomen all require "relaxation", which helps to stabilize the center of gravity, enhance the strength of the legs, stabilize the footwall, use the ground reaction force, increase the explosive force, make the energy calm, and "focus on one side" advanced technology can make opponents throw into the air.