The special nature of Tai Chi Chuan practice was attributed to the ninth generation Chen Village leader, Chen Wangting (陳王廷; 陈王庭; 1580–1660). He codified pre-existing Chen training practice into a corpus of seven routines. This included five routines of tai chi chuan (太極拳五路), 108 form Long Fist (一百零八勢長拳) and a more rigorous routine known as Cannon Fist (炮捶一路). Chen Wangting integrated different elements of Chinese philosophy into the martial arts training to create a new approach that we now recognize as the Internal martial arts. He added the principles of Yin-Yang theory (阴阳; the universal principle of complementary opposites), the techniques of Daoyin (leading and guiding energy), Tui na (expelling and drawing energy), the Chinese medical theory of energy (气功) and Chinese medical theory of the meridians (经络). Those theories encountered in Classical Chinese Medicine and described in such texts as the Huang Di Nei Jing (《黃帝內經》; Yellow Emperor's Canon of Chinese Medicine). In addition, Wangting incorporated the boxing theories from sixteen different martial art styles as described in the classic text, Ji Xiao Xin Shu(繼效新書; "New Book Recording Effective Techniques"; ~ 1559–1561) written by the Ming General Qi Jiguang (戚繼光; 1528–1588).