This study is conducted within the University Centre of Excellence for Studies of Human Motoric at the Faculty of Physical Education and Sport, Charles University. The project focuses on research investigating mechanisms that support motivation for participation in physical activity among children and youth. In recent decades, participation in physical activity has been declining globally, including among children and adolescents. Understanding the factors that influence motivation for physical activity is essential for developing effective strategies to support long-term engagement in physical activity. The study aims to contribute to knowledge about the role of physical activity and physical education in promoting children's long-term physical and mental development.