The paper analyzes the physical activity of children and young people, with special emphasis on its role in extracurricular activities and free time, including recreation and sports. Today, lack of physical activity represents a significant health challenge and a pervasive social problem in today's world. The connection between lack of physical activity and the problem of obesity in children is increasingly recognized. The prevalence of insufficiently active children and adolescents varies between countries, with a tendency to increase activity in the transition from primary to secondary school. There is a visible difference in activity between girls and boys, with greater challenges for girls. Sport has a significant impact on the socialization of children and young people, through teamwork and interaction with peers, young people develop social skills, learn to cooperate and develop a sense of belonging. Attention as a cognitive ability plays a key role for successful behavior in various spheres of life, including education, social and sports life. The psychosocial development of children is also affected by sport because it provides an opportunity to express emotions and face challenges. Sport can have a positive impact on mental health, reducing stress, anxiety and depression. Family and especially coaches have a key role in supporting child athletes, providing them with the necessary support and mentoring. Sport is an important factor for improving the quality of life of children and young people, encouraging their healthy development, social integration, personal growth and overall development.