Physical activity is a predisposing factor for health that brings many benefits for adults as well as children. Through exercise, children not only grow physically and mentally, but also develop in a much healthier environment than in a sedentary climate. Physical activity, through sport, provides a fascinating way for children in which he or she is exposed to a variety of social challenges. It is through these factors that the child grows as a person, who with a focus on health, can be placed as one of the main contributors to a sport. The aim of this report is to hypothesize that there are differences in the physical fitness of children who practice different sports. To investigate this, various metrics and tests were performed, such as height and weight measurements, subcutaneous adipose tissue, upper arm circumference, thigh circumference, and arm and leg taping tests. After testing, the obtained results showed differences between children in different sports across multiple segments. For example; volleyball players were taller than other groups. Also, handball players had significantly better results in hand-taping. We can conclude after analyzing the results that children developed specific characteristics in direct correlation to sport. An example of a trait obtained during the study include the speed of the handball players, which was significantly higher compared to other sports. However, due to the small number of respondents and other inability to research, it cannot be said with certainty that these changes are due to sport or are predisposed. There are indications that certain oscillations occur, and this report suggests that more research is needed to confirm the hypothesis.