Sivananda
 

        Sivananda is one of the world's largest schools of yoga. Developed by Vishnu-devananda and named for his teacher, Sivananda yoga follows a set structure that includes pranayama, classic asanas, and relaxation. Vishnu-devananda wrote one of the contemporary yoga classics, The Complete Illustrated Book of Yoga. First published in 1960, the book is still one of the best introductions to yoga available.