The book of the candidate of medical sciences V. Ivanchenko for the first time traces the thousand-year experience of hardening the inhabitants of Russia: the sun, air, water, food, plants. It sets out a system of wellness procedures accessible to everyone from a young age, including sunbathing and air baths, ice dousing, early swimming, a bathhouse, self-massage, and mental stamina, exercises to stimulate immunity and other secrets of the ancient Russian temper.