The terms of Xingyi Quan’s three levels of practice—Ming Jin (明勁), An Jin (喑勁), Hua Jin (化勁)—came from Guo Yun Shen and were systematized by Sun Lu Tang, who proposed three levels of practice:
- training the Jing to transform into Qi
- training the Qi to transform into Shen
- training the Shen to return to emptiness.
The practice method of the three Jin is mainly used in the Five Elements Fists. Each fist is practiced in three ways. First, master the hard movement so that you can face the enemy; then begin to practice sets of the form; finally, go back to the beginning to train An Jin. When you are proficient you can train the Twelve Animal forms, before finally training the Five Elements Hua Jin.