books.google.com - Orthopaedic surgeon Ray Long blends modern science and the ancient art of hatha yoga to create an indispensable resource for every yoga practitioner -- from beginners to experts. A scientific approach to understanding the practice of hatha yoga: through full-colour, three-dimensional illustrations of...http://books.google.com/books/about/Yoga_Mat_Companion_3.html?id=v2C46bjktOkC&utm_source=gb-gplus-shareYoga Mat Companion 3