Modern socio-economic and political problems in Ukraine, associated with martial law, place high demands on the physical health, performance and active physical condition of schoolchildren. Boxing is currently very popular among many youth sports. The purpose of the study is to experimentally test the effect of boxing on the physical health of young athletes at the stage of initial training. Methodology. To solve the problems, the following research methods were used: analysis of scientific and methodological literature; sociological methods (survey, conversations, questionnaires); pedagogical methods (pedagogical observation, pedagogical experiment); physiometric and index methods; methods of mathematical statistics. The scientific novelty of the study lies in the improvement of the methodology for using boxing tools to improve the health level of young athletes at the stage of initial training. Results. The formation of the experimental methodology was based on the following pedagogical provisions: an integrated approach to the development of physical qualities; health-improving orientation of boxing classes, which was ensured by regular physical activity, compliance with general didactic principles of accessibility, gradualism and age-appropriate technical and physical tasks, as well as by conducting the vast majority of classes in the fresh air. Conclusions. The final assessment of the level of physical health of the test subjects in the experimental group corresponds to above the average level of health, while for the young boxers in the control group it corresponds to below the average level of health. This fact indicates the effectiveness of the introduced boxing training methodology at the initial training stage.