This is a detailed look at the anatomy of the human body, primarily structured around different types of yoga asana: standing postures, backbending postures, forward bending postures, twisting postures, and so on. There is a huge amount of anatomical and physiological detail contained in the book.
Anatomy of Hatha Yoga
By H David Coulter
Practicing with total attention within the body is advanced yoga, no matter how easy the posture; practicing with your attention scattered is the practice of a beginner, no matter how difficult the posture. Hatha yoga trains the mind as as well as the body, so focus your attention without lapse.