This book, based on both the author’s extensive experience and much scholarly research, explores the complex terrain of Yoga and its controlling principle, Kundalini Shakti, in the light of modern knowledge. He surveys the real aim of Yoga, how it can be achieved and describes the various steps of Yoga practice, the purpose they serve, and the physiology behind them. He does this in light of the biological aspects of this comprehensive discipline, and explains why a clear understanding of the goal to be reached is essential for achieving success in this endeavor.