Proper posture is an indicator of good health, proper growth and development, which is why it is important to start learning about posture from the earliest age using various forms of physical activity. To establish the impact of physical activity on aspects of posture components of children of school age. The study included 120 subjects aged 10-16 years who were grouped into three groups, which was stratified equal number of boys and girls. The first group consisted of 40 children who are actively practice sports. The second group consisted of 40 children who are not actively practice sport a third group of 40 children with deformity of the spine. For research purposes, we used: test for assessing the degree of physical activity and test for the assessment of body posture. By applying multiple regression analysis, we found that there is an influence of different predictors on the dependent variables in all three categorically defined pattern. The strongest positive correlation was found in the first sample categorically defined between predictors warming up exercises in the training and position keeping the legs, and the amount of connections is β = 0.43. The strongest negative correlations were established also at first categorically defined pattern between predictors time spent at the computer and position keeping the legs, and the amount of connections is β = -0.35. It was found that there is a difference in the level of physical activity between the three categorically defined sample (F = 95.687, p = 0.01), and also the difference in posture between the three categorically defined sample (F = 10.93, p = 0.01). The results show the necessity of promotion of various forms of physical activity of children school age in order of their proper growth and development.
