According to the legend of Yijinjing, Tianzhu and Buddhism are both scriptures, which came from the east alone, while Yang Lu disappeared in Shaolin Temple as soon as he recited Buddhism. Dharma has profound internal strength. He meditated on the side wall of Shaolin Temple for nine years, so that his figure was left on the stone wall. After receiving the news, Dharma left two volumes of secret scriptures, one is "Washing the marrow" and the other is "Yijin Sutra". "Washing the marrow" is a classic of internal cultivation, which belongs to Hui Ke and has not been circulated in the world. Yijinjing, a book of external revision, stayed in Shaolin and has been passed down to this day. However, modern archaeological data prove that Yijinjing was actually created by Taoists in Tiantai, Zi Ning at the end of Ming Dynasty, which was initially guided by Taoism and had nothing to do with Buddhism.

The content of Yijinjing includes two main contents: the ideal effect that can be achieved by practice and the specific practice methods. The sentence "Being brave inside and being strong outside" has the greatest influence on martial arts novels. After practicing this skill, he mentioned in "Inner Strength and Courage" that "divine power is born of bones, and its arms, wrists, fingers and palms are unusual and hard as stone, and the fingers can enter the belly of an ox, and the palms can break the head of an ox". These are just the last small uses; After the practice of "external power", it is not surprising that "holding the gate and lifting the tripod vigorously". The Yijinjing mentioned in the martial arts novels during Daoguang period was only after practice that this magical function was rendered.

Among all kinds of martial arts novels, Yijinjing is the martial arts secret book that Wulin people dream of. The reason why Jin Yong's novels swim in Jin Yong's "Eight Dragons" is because he learned that Yijinjing comes from healing and drives away the cold poison in the body. It is also because he learned Yijinjing from an unknown junior and became one of the best masters in the Jianghu. The Yijinjing magical power introduced in the legendary swordsman was created by Dharma, the ancestor of Dongtu Zen, with divine power. "It is because it has not been passed down by its people for hundreds of years and has not been passed down by its fate." Even the excellent disciples of Shaolin Temple will not teach without blessing. "In the legendary swordsman, Ling Huchong has several kinds of true qi in his body, which can only be solved by Yijinjing, but only if he joins Shaolin. Ling Huchong would rather die than learn this lesson. Because of his contribution to the Jianghu, Master Zheng conveniently spread this sutra to Ling Huchong under the guise of the cool breeze. Yijinjing, Jiuyin Zhen Jing, Jiuyang Zhen Jing and Zhao Shen Jingjing are also called the four internal skill cheats written by Jin Yong.

Yijinjing is a kind of health-care exercise with both internal and external cultivation. It is said that it was created by Tianzhu and Dharma in the Liang Wudi era. Yijinjing refers to the method of changing bones and muscles. Regular practice of Yijinjing can achieve the effect of preventing and treating diseases and prolonging life. The martial arts novels after Daoguang often mentioned Yijinjing, exaggerating the magical function after practice, which caused some misunderstandings and differences in our understanding and understanding of Yijinjing's function. The editorial board of this book intends to restore the essence of Yijinjing's health-keeping skills, emphasizing its efficacy of preventing and treating diseases and prolonging life, so as to facilitate more health-keeping enthusiasts to learn and master it.