Hsing-I uses the same Five Element Theory as acupuncture for health, and for martial power and balance as well. The I-Ching uses what is there before it takes form, Hsing-I uses this I to stage the stepping motion to aid in the positioning, momentum and anchoring to hit with combined internal power. Many Qigong practices the same energy focus involving the Lower Dan Tien; Hsing-i directs its rooted power with the Lower Dan Tien. To practice Tai Chi, Ba Gua, or even Qigong without a real grasp and feeling of Qi, is to go through the motions with an empty shell. The Qi moving through the moves, and in between the moves; is what gives the internal its power. Without Qi, these are no more than a pretty dance; as a car is when an engine is running in neutral. The hollow shaft of a metal arrow can deliver some martial force; however when that tube is filled with a propellant and payload, it becomes a jet or missile. This books focus is the development, feeling, testing and using Qi yourself.