This brochure summarizes the practical experience of a sports doctor-psychotherapist who worked as a mental training coach with young tennis players. The main task of the proposed system of mental training is to activate athletes for independent, purposeful use in personal practice of the processes inherent in the mental apparatus - in the brain. The manner of presenting the material is quite simple, which allows young athletes not only with the help of coaches, but also to independently master the various capabilities of the proposed system of mental training in tennis.