Why Chinese martial art need prctice Nei Jin

Nei Jin means correct body structure ,it will train your bone and tendon , let you more health and more powerful .
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[@kaisekiryori]

Fascinating demonstration, but how exactly do you use the spine to achieve that result?

[@user-zz4gz2om9r]

We use "Zhanzhuang" to build up correct body structure, then base on this you have chance to apply spine force to your hand.