This book explains why breathing is important in Hindu yogi practices. It's written in simple language to help Westerners understand the breathing techniques and exercises used by yogis. The book covers how breathing affects the body, mind, and spirit. We've avoided using confusing Sanskrit terms and focused on explaining things in easy-to-understand English. The book starts with the physical aspects of breath, then talks about how it affects our thoughts and feelings, and finally touches on its spiritual side. We're proud of packing so much yogi knowledge into a small space using words that everyone can understand. Some might think it's too simple, but we believe that the practical-minded Westerners will see its value soon enough. So, welcome to your first lesson in the yogi science of breath!