Scientific Keys Volume I: The Key Muscles of Hatha Yoga is a 244 page book with over 650 full color illustrations covering over thirty key muscles as applied to Hatha Yoga including biomechanics and information on the chakras.

This is the third edition of "The Key Muscles of Hatha Yoga" by Ray Long and Chris Macivor. There is a new cover, over 50 new pages with an expanded chapter on the breath and more biomechanics in yoga. New sample chapters are available to view on-line at www.bandhayoga.com.