'An Introduction to Yoga' by Annie Besant gives an overview of Yoga, in order to ready the student to take up, for practical purposes, the Yoga sutras of Patanjali, the chief treatise on Yoga. This book leads to the way where tranquility can be attained that can make life peaceful and healthy. Annie Besant explains the theory of spiritual development based on the teachings of yoga. In the first lecture, 'The Nature of Yoga', Besant talks...