Many books have been written about pranayama, but there is a lot of confusion in them. In particular, this applies to the Sanskrit word "prana." This most important term in yogic teaching is often used too freely, which misleads many yoga adherents. The author of this book, the brilliant Indian yogi and sage Swami Narayanananda, widely and at the same time illuminates this difficult issue in detail in an understandable language, again and again drawing the reader's attention to the fundamental, key provisions of the yogic science of Prana and pranayama.