What are the action requirements for pulling back and sinking shoulders and elbows? What is its function?

Pull back with the chest: the chest is slightly concave inward, and the white back naturally protrudes outward to form an arc, which is the pull back degree.

Shoulder sinking and elbow lowering: at the beginning of shoulder sinking, the shoulders should be relaxed to prevent hunchback; Then consciously stretch the shoulder muscles and ligaments, so that the shoulders sink and sag, and at the same time slightly bend forward (that is, slightly bend). Elbow drooping means that the tip of the elbow often droops. Except that the elbow is higher and parallel to the shoulder, the tip of the elbow should be vertically downward.

The purpose of pulling out the back with the chest is to make the back have an outward circle. After the arm is relaxed and forced, you will feel that the outer side of the arm and the back have an outward support ring together, which is the support force of Tai Ji Chuan.

Extended data:

Tai Ji Chuan usually takes a deep breath in the abdomen, so he adopts the method of "chest-containing" in the chest to strengthen the intensity and depth of breathing without increasing the breathing frequency, so as to reduce the phenomenon of asthma during exercise. It's just the opposite of chest breathing.

A chest is different from a concave chest in tension adduction. Having a chest means that the chest should feel relaxed. Chest-containing also plays an important role in fitness. The acromioclavicular joint is relaxed, the shoulders lean forward slightly, and the ribs are slightly gathered, which makes the upper and lower diameters of the chest longer, and the diaphragm has the opportunity to descend and stretch. The chest does not change with the movement and is fixed.

The chest is flat, not concave or convex, and can naturally form a diaphragm and take a deep breath. At the same time, due to the expansion and contraction of the diaphragm, the abdominal cavity and liver are subjected to a tight and loose abdominal pressure, which is very helpful for transporting blood and promoting liver function.

Because the pectoral muscles rotate up and down, left and right, holding the chest plays an important role in technical attack, and all techniques that use strength (that is, walking strength) cannot be separated from holding the chest. So "On Boxing" says: "Two arms are connected" and "Everything is in the chest and waist". Having a chest is the "accumulation" of the chest.