In this book you will find answers to questions related to energy management, maintaining health and amateur sports. How to replenish energy during the day? How to improve your diet? What are the benefits of sports and how to do them correctly? What is sports nutrition? Is it possible to play sports in old age and after serious illnesses? The chief physician of the Russian national football team, Eduard Bezuglov, and ultramarathon runner Renat Shagabutdinov give comprehensive comments on each of these and many other issues, sharing life hacks and tips based on their personal experience and numerous scientific publications. The book will be of interest to amateur athletes, as well as everyone who want to be healthy, active and productive.