The difference between the post "Eight Essentials of Pose" and the former "Eight Essentials of Pose" is "hip protection" and "crotch drop". Yan Jiao's "hip protection" means "the hip is relaxed and natural, and the front part is restrained", which is very similar to the "hip retraction" in contemporary Tai Ji Chuan technology, but for "hip lowering", it puts forward the connotation that has nothing in common with "hanging the hip": "Hip lowering must be slaughtered at the waist, with the spine as the axis, and the limbs are driven by the body to change the turning direction."