This book is about the art of breathing, based on modern scientific research and ancient practices, and how breathing affects human health. The author, a journalist and researcher, talks about experiments with his own breathing and the numerous practices he tried. The book also touches on questions of evolution, history of medicine, physiology. J. Nestor describes a number of breathing techniques with detailed instructions that will, in particular, improve lung function, reduce heart rate, blood pressure and stress levels, and remain calm and focused in stressful situations. The publishing layout is saved in PDF A4 format.