Master the science behind the arm balances and inversions of Hatha Yoga. Dr. Ray Long guides you on a visual narrative through the anatomy, biomechanics, and physiology of this ancient art, decoding each pose along the way. The Mat Companion series provides you with beautifully illustrated, step-by-step instructions on how to use scientific principles to obtain the maximum benefit from your practice. Each book includes the Bandha Yoga Codex, a simple five-step process that can be applied to any pose to improve strength, flexibility, and precision -- no matter what style of yoga you practice.