In the modern era, the popularity of yoga has increased among people to achieve good health, to get rid of diseases and to attain long life. There are very few books written by medical doctors on the effect of various processes of yoga such as asanas, pranayama and internal purification actions on the body. This book is going to prove equally useful for medical students and yoga students. Apart from this, this book can be very useful for anyone who sees yoga from a modern perspective.