<p><strong>The purpose of the work</strong><strong>: </strong>to determine the impact of Kyokushinkai Karate classes on the ability to adapt to different physical activities of boys of 10-12 years of age during classes.</p><p><strong>Material and methods</strong><strong>. </strong>78 boys of 10-12 years were surveyed, 27 of them expressed their desire to participate in the sports section of Kyokushinkai Karate (EG). CG (29) includes guys who do not have contraindications for playing sports. The essence of the forming experiment was to compare the growth rates of individual indicators of physical qualities, functional preparedness of children who attended the Kyokushinkai Karate training program (experimental group - EG) with children who were engaged in physical education only during physical culture lessons (control group - CG). During the year a monitoring examination of children is carried out to assess physical development, adaptation to exercise, adaptive potential of the circulatory system, the functional state of the apparatus of external respiration, the energy potential of the organism, physical fitness and methods of mathematical statistics.</p><p><strong>Results</strong><strong>. </strong>The plan of preparation of training groups on the basis of rational sequence of use of a set and volume of means and methods of physical education of normative part of the сurriculum "Kyokushinkai Karate" is presented. Adaptation processes occurring in the body of boys, during the acquisition of knowledge and skills within the walls of the school are determined by a number of educational, behavioral, everyday and other factors, each of which has a specific purposefulness to achieve a useful end result of learning. The course of study at school is undoubtedly accompanied by the adaptation of children to the new mode of study, rest, psychological and physical activity, and the question of the dynamics of indicators of functional systems of the child's organism came to the plane of our research.</p><p><strong>Conclusion. </strong>In the course of the research, we came to the conclusion that the plan developed and implemented in the sports circles improves the adaptation capabilities of the boys of this age group during Kyokoshinkai karate classes.</p>