The key principle of the "60-minute rule" in children's physical activity states that children should engage in at least 60 minutes of moderate to vigorous physical activity daily. This guideline aims to promote a healthy lifestyle, reduce obesity, and improve physical fitness among children. Activities can include play, sports, and recreational activities that encourage movement. Regular physical activity is vital in enhancing children's overall health, supporting healthier growth patterns, and fostering lifelong habits of an active lifestyle.