see the outline of the essay saying that all martial arts in the world are based on internal force. Although internal force can be divided into high and low, strong and weak, strong and weak, it all comes from the spirit. the word "Spring", and their origin is the same. Extreme rigidity leads to softness, softness can also give birth to hardness, just like all things change, eventually converging on the principle of "Spring". If one can master this metaphysics, one can understand the origins of martial arts. , Luc Van's expression of anger just now suddenly became dull, his eyes fell on Liu Nai's hand, his cheeks turned red from being pulled. "Let go, I'm fine, I'm fine!"