In the world constructed by martial arts novels, the "Yi Jian Jing" is quite a mysterious existence. The point kung fu in reality is not as magical as rendered in martial arts dramas.
As early as the Qing Dynasty, some notes mentioned the Yi Jian Jing, which was already a "martial arts secret book" at that time. The Yi Jian Sutra is divided into two aspects, namely the two aspects to real life, namely "Returning to the Tendon" and "Twelve Tendon exercises"