Five introductory sections in Part I serve to define the essence of Nei Kung — its origins, history, and basic physical and mental principles. Using precise terms and avoiding “mystical” language all of the fundamental concepts: “deep breathing,” “head suspended,” “pelvis tucked in,” “body rounded,” and so forth, are clearly explained and well illustrated. Part II contains the precious Nei Kung exercises that were developed, refined, and handed down from master to student since the Yellow Emperor period (2696-2598 BCE). Some of these exercises were inspired by observing and imatating the natural and integrated movements of various animals, for example “Rhinoceros Gazes at the Moon,” “Owl Turns Head,” and ” Phoenix Spreads Wings”.