This book is a brief and easy to understand introduction and instruction in the Yogi science of breath control, and proper rhythmic breathing. It gives several specific exercises which it claims will help heal body, mind, and spirit with proper practice. I have been practicing the exercises which seem to be what I would consider to be the equivalent of physical exercise but for the lungs, diaphragm, and air passageways. They feel good but it is too early to give any definitive testimonial yet. The Yogi philosophy is also introduced briefly which I found interesting and would like to study more about. From what I can tell practicing Yogi philosophy highly depends on a belief in reincarnation as a truth of our reality. I believe reincarnation is a possibility but if it turns out to not be true, the holistic practice of Yoga and all its many branches would feel like a bit of a waste to those of us who like to enjoy the journey. I would like to in the future study and compare the Yogi philosophy with the Taoist philosophy from China which seems to depend less on belief in reincarnation or afterlife.