It is said that the origin was when Yue Fei wanted to enhance the battlefield combat capabilities of his soldiers, he transformed his spear skills into a set of boxing techniques to teach his subordinates, integrating his spear techniques into the boxing set, thus it became 'transforming spear to fist'.
The fist is the spearhead, the intent of the spear is the intent of the fist.
In the preface of "The Study of Xingyi Boxing", Sun Lutang mentioned that Xingyi Boxing was invented by Yue Fei, King Yue Wumu, during the Song Dynasty. In the Yuan and Ming Dynasties, because the boxing techniques were not documented in books, they were almost lost in the martial arts world.
It wasn't until the late Ming and early Qing Dynasty that a highly skilled man from Pudong named Mr. Ji Jike, in the process of searching for a master on Zhongnan Mountain, was taught several manuscripts of Yue Fei's boxing techniques by an extraordinary person.
