The document discusses the importance of physical education in schools. It notes that childhood obesity has more than doubled in the past 30 years as children have become more sedentary. Physical activity provides health benefits like stronger muscles and bones, weight control, and decreased risk of diabetes. It recommends that children get at least 60 minutes of physical activity per day, including both structured activities like gym class and unstructured play. Regular aerobic exercise can strengthen the heart and lungs.