By Dr. Yang, Jwing-Ming. 389 pages, paperback. Qigong practitioner must learn Internal Elixir Qigong. The first step to learning is to understand the theory and the method of Embryonic Breathing. Practicing this breathing technique will help you to establish your central energy system, conserve your energy, and store the energy to abundant levels. Once you have established this foundation, you'll be able to practice Small Cyclic Heaven and Grand Cyclic Heaven effectively.