Made accessible to an English-speaking readership for the first time, this study of the sacred Sanskrit text explores how earlier tantric yogic techniques were developed and mutated into the practices of hathayoga. 'This remarkable book is the second volume of the Routledge Studies in Trantric Traditions, edited by Gavin Flood. Beautifully produced by the author.....Due to the highly technical nature of the material, this winning combination of authorial attention to detail with a highly elevated sense of aesthetics, results in not merely a book but a work of art. A Stellar work of exemplary scholarship, this book should be purchased by individuals with an interest in Yoga and Tantra, and all university libraries.' - Christopher Key Chapple, Loyola Marymount University, Journal of Hindu Studies 2008