This book is a real gem if you are interested in either old or ancient texts, or in this case, yoga and old ancient texts. The Hatha Yoga Pradipika is a classic Sanskrit manual on Hatha Yoga written by Swami Swatmarama in the 15th century (A.D.) and has the original Sanskrit with translations on every page. The text is easy to read and a fascinating contrast with 15th century pre-occupations in the West. It contains the main roots of all tenets of Hatha Yoga and makes for an informative and interesting read. It is probably not just for a lay reader with no interest in yoga.