Yoga
Imprpove your balance, flexibility, strength and mental well being - take up yoga. Why not try Ashtanga Vinyasa Yoga?
Ashtanga Yoga: Practice and Philospohy
by Gregor Maehle
This book goes through the history of yoga, the fundamentals of breathing, bandhas, drishti, vinyasa and yoga terminology. The postures are clearly illustrated and come with instructions and practical tips. There is information on the philosophy and mythology of Yoga Sutra.
Whether you're just starting out or actually teaching yoga, this is an invaluable resource.