All the essential knowledge of the mental science of Yoga is contained in this complete illustrated handbook: asanas (postures), breathing exercises, concentration, meditation, diet and philosophy. Swami Vishnudevananda, outstanding and accredited world authority and teacher of Hatha and Raja Yoga, explains and instructs, in the most clear and direct language of words and picture, the means to the conquest of old age, disease and death through the development and understanding of timeless Yogic wisdom.