URGENT! In connection with the pandemic, a patented method of breathing control (in particular, ventilation) is being proposed. The book gives an idea of how to use the currently more effective and less energy-consuming type of breathing, correctly measuring the strength of your body and without drug intervention; maintain in optimal mode synchronously with natural rhythms. The administration of the liters website is not responsible for the information provided. There may be medical contraindications; consultation with a specialist is required.