This work is based on a kinematic analysis of the motor structure of rolling in early and preschool children in order to determine possible deviations and differences and possible influences when performing given motor tasks of rolling. Kinematic analysis of the motor structure of rolling in early and preschool children was conducted on children aged 31 to 85 months, that is, on 21 children from the "Morčić" Kindergarten in Rijeka. Some research participants go to an educational group with implemented sports program. A necessary part of the research was recording the performance of 3 given motor tasks of rolling (straight, with a ball and down a slope). Based on the aforementioned recordings, a kinematic analysis of rolling was performed. The Kinovea program was used for video processing, that is for performing kinematic analysis. The variables that were measured were turning on the back and on the stomach, activation of the head and trunk in the transition phase, the position of the arms and legs, the duration of the turning cycle, and the number and connection of the cycles. Furthermore, the correctness of the execution technique, the deviation in the legs and hips, and the tracking of the trajectory during rolling were studied. The results showed diversity in performance, which may be a consequence of genetic and physical differences among children. Also, deviations in body mass were detected in individual children, suggesting the importance of monitoring children's eating habits and health. Analysis of the relationship between body mass index and kinematic variables showed complex interactions, and there is a statistically significant relationship between kinematic variables and body mass index. The results of the research show that morphological variables such as the child's height, weight and age have a great influence on the performance of the motor task of rolling. In the kinematic analysis, statistically significant differences were observed in the performance of motor tasks among children. These results indicate the importance of adapted exercises according to the individual abilities of children. Ultimately, the research emphasizes the need for careful monitoring of nutritional status and adjustment of exercise programs in order to promote optimal physical health and motor development of preschool children