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The aim of this research was to investigate morphofunctional features and physical fitness of boys 6 - 9 years old under the influence of various physical activity. The research performed in 2020 comprised 246 boys of 6 - 9 years old with different physical activity (121 children who are not involved in sports; 79 martial artists and 46 gymnasts with experience of 8 months and 4 years old). It was found that systematic sports activities of 6 - 9 years old boys have a positive effect on physical fitness and optimize morphofunctional indicators of physical development. The effect of the sport on the physical development and fitness of the boys depends on the start date and time of training sessions: a higher level of young gymnasts physical fitness is accompanied by a more intense adaptation of the cardiovascular system relative to martial artists. Differences in morphofunctional state and physical fitness between boys who are not involved in sports and young athletes are least significant in 6 year old boys, intensifying as growing up and increasing sport experience. It is more typical for gymnasts.

Morphofunctional features and physical fitness of boys 6 - 9 years old under the influence of various physical activity