In recent years research have shown a significant decrease in physical activity (PA) among young population. Increasingly carried out diagnosis of physical activity at different stages of our lives, with particular regard to children and adolescents indicates that with age, level of physical activity, especially in leisure time is reduced. The purpose of the research is to compare the selected parameters of physical activity during one day among students aged 6–8 years old. The study was conducted with use of the accelerometer ActiGraph WGT3X on group of 54 children (30 – school and 24 – kindergarten). Analysis shows that for such parameters as MET’s, Vigorous, Total MVPA and Steps Counts one observed difference between the stay at school and sometimes school has statistical significance (p < 0.05). On the basis of the studies carried out it is shown that the school environment helps to increase physical activity among children in school and the fact is that these children are more active.