We can live without food for weeks, without water for a few days, and without air for just a couple of short minutes. We spend a lot of time eating and carefully watching what we eat and drink, but pay little attention to the air we breathe. The amount of oxygen you breathe can change everything you think about your body, health and performance, regardless of your physical fitness. Whether you're a non-athletic person who's just trying to get off the couch, a "weekend warrior" who runs the occasional 10K, or a professional athlete who needs to have an edge over the competition, the amount of air you breathe is an important factor. for many aspects of your life.In this book, you will discover the fundamental relationship between oxygen and the body. Improving physical fitness depends on increasing the supply of oxygen to muscles, organs and tissues. Increased oxygenation not only improves health - it also allows you to increase the intensity of exercise with a decrease in shortness of breath. In short, you will be able to improve your health and fitness, as well as increase your performance.Editorial layout preserved in PDF A4.