This document discusses physical activity guidelines for children and adolescents. It recommends that youth engage in at least 60 minutes per day of moderate to vigorous physical activity, including aerobic, muscle-strengthening, and bone-strengthening activities. Examples are provided of a 7-year-old boy, Colin, and 16-year-old girl, Maria, meeting these guidelines through activities like walking, playing, sports, and exercise classes. Barriers to physical activity such as attitudes, peer influence, safety, and time are also outlined.