You don't need to have done any kind of yoga before to be able to use this book to improve your life. All you need is a floor, a blanket and a friend to read to you, or a cassette player. The exercises, and the theoretical descriptions in the first part of the book, have given me huge stores of energy, motivation and concentration, in all of my activities.
It's extraordinary to think that this great Swamiji, born in a small village in the Himalayan foothills, has written so many clear, lucid textbooks to guide truth seekers all over the world.
On a sideline, I have listened to quite a few Yoga Nidra tapes made by other great teachers in other yoga schools, but have not encountered any quite as good as those I've recorded onto a tape from this book.
I'm quoting here the end of the "Sacred mountain" visualisation that I hope one day to be able to master in my practise - it is in my 1984 edition, although it may not be in the recent editions, it should give you a flavour of the sacred knowledge Swamiji is imparting onto us.
"You trudge languidly on alone... and finally reach the top... Where the guide is waiting for you. As you observe the spectacular panoramic view, a feeling of exhilaration floods through your body and mind. The guide gives you a meaningful smile... And you are grateful to him for his forcefulness during the climb. You are exalted by the environment; you are overcome by a feeling you have never experienced before. You are still absorbed in this exhilaration when the guide says to you "Follow me"... and leaps from the peak and disappears into space... without a further thought you follow".