"The body is like an airbag" means that the body is like a big balloon filled with air when boxing, which expands and contracts with the accumulation and opening and closing of boxing potential. When gaining power, the energy flow in the body ("internal qi") is recovered from the four ends to the abdomen, and the body feels contracted. This process is called "combination" and belongs to yin; When hair grows, the energy flow in the body spreads from the abdomen to the four tips, and the body has a sense of expansion. This process is called "opening" and belongs to Yang. We call the continuous and rhythmic stretching feeling of the body with the change of boxing potential "surge of opening and closing". The feeling that the body expands and contracts like an airbag is actually what we often call "shed force", and "opening and closing surge" is the result of the filling change of shed force in the body. Disengagement is a spring force that combines rigidity with softness, and it is an expansion force with a sense of ball. It is the "mother strength" of all Tai Ji Chuan's strengths, such as sliding, squeezing, pressing, picking, platoon, elbow and leaning. Therefore, Tai Ji Chuan is also called "Liu Jin Quan". The ups and downs of Tai Ji Chuan's shed strength indicate the depth of the boxer's kung fu, which has a great influence on the effect of fighting health.
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