C181 Shocking the world

In martial arts novels, the highest level of cultivation was the inner force. For example, the "Nine Yin True Scriptures" focused on inner force, while the "Eighteen Subduing Dragon Palms" and "Iron Palm" specialized in external force. Why was the "Nine Yin True Scriptures" the highest level of martial arts? It was precisely because it cultivated inner strength.

In the martial arts world