Physical activity plays an important role in the development of children of primary school age, affecting their mental and physical health. Regular exercise improves mood, reduces stress, and also affects the development of social skills through team sports. Physical inactivity is the fourth cause of mortality in the world and represents a significant social and health problem, so intervention is necessary from an early age. Potential negative sides of physical activity are injuries and overtraining. Physiotherapists also play a role in improving physical activity, from assessment of motor skills, physical condition, development of individualized exercise programs, continuous monitoring of progress, all the way to educating children and their parents. Perhaps the most important role in raising children's awareness is played by parents who, to begin with, must be role models of positive habits so that they themselves practice regular exercise and lead an active lifestyle with a healthy diet. In addition, psychological support for children is also important, which includes praise and encouragement as motivation for achieving set goals. The school is also a place of health promotion, where specially trained employees work in the field of physical education. Municipalities and cities should be involved in the modernization of playgrounds, the organization of sports and other social activities, and in this way all together ensure a positive environment for the younger generations.