One of the indicators of the physical development of children is the state of their musculoskeletal system (Kashuba et al., 2017; Ivanchykova et al., 2018; Metalnikov, 2020). Its correct position is evidence of the child’s harmonious physical development. The analysis of scientific literature sources indicates a significant prevalence of deviations from the musculoskeletal system in children and adolescents in various countries (Balkó et al., 2017; Kashuba et al., 2019). Musculoskeletal system disorders are most often recorded during the period of intensive growth and puberty of a young organism (Metalnikov et al., 2021) The correct formation of a child's postural status largely depends on the body muscular system development, which performs the function of a muscular corset. The ability of the muscular system to work effectively and for a long time in static mode allows maintaining the correct position of the trunk (Kotliar et al., 2019). One of the causes of disorders in the musculoskeletal system in children is flat feet, which shifts the center of gravity of the trunk, which causes vertebral column deformation (Romanova et al., 2022a). In more than 90% of children, flat feet occur simultaneously with a violation of postural status. Heredity and numerous environmental factors influence musculoskeletal system disorders. Various deviations from the child's spine negatively affect the work of the cardio-respiratory, digestive, nervous and other functional systems of the body. As a result, physical performance, cognitive abilities decrease and the quality of life deteriorates (Kozina et al., 2017; Timnea et al., 2019).