This paper deals with the topic of the connection between the level of physical activity and the possibilities of participation and obstacles to the implementation of kinesiological activities. The terminological determinants of free time are presented, how students can participate in various physical activities in extracurricular and out-of school activities, and what are the possible barriers in carrying out kinesiological activities. The research was conducted in the Petar Preradović Elementary School in Zadar and the Domovinske zahvalnosti Elementary School in Knin, in which a total of 200 third and fourth grade students participated. The aim of the research was to determine the level of physical activity and what are the possible obstacles in playing sports and choosing the preferred leisure activities of children in primary school students in primary schools in Knin and Zadar. The aim of the research was to determine the connection between the level of physical activity and perceived barriers. Furthermore, the aim was to determine whether there were statistically significant differences in the level of physical activity with regard to the gender of students and the city in which they live. The obtained results show that students are moderately physically active and that the biggest barrier to the implementation of physical activity is a motivating factor and that there is a connection between some domains of physical activity and barriers to their implementation. It was found that there is no statistically significant difference in the level of physical activity and perceived barriers with respect to gender. Regarding the level of physical activity and limiting factors with regard to the city, students of the Zadar school are more involved in sports activities in their free time and are more physically active during the big holidays than students in Knin. Although it has been shown that students of the Zadar school are more active in their free time than students of the Knin school, students from Knin are more physically active during the weekend than students in Zadar. A difference was also found for objective obstacles in which students of Knin schools are not able to exercise due to family and inaccessible facilities.