 It contains mostly military-oriented attacks, and is based primarily upon the principles of combining internal and external techniques, theory and application.Its various tricks stem from its principal philosophy of the positive and negative and the five elements of the heart, liver, lung, spleen and kidney in the human body.This art created by Yue Fei includes Eagle Claw Chin Na submissions and other fighting techniques that would later become the basis of the creation of Xing Yi Quan.