According to the Center for Disease Control, physical activity for children has an abundance of benefits. The AMA Has GuidelinesSo, how much exercise do your kids actually need? That hour of activity should include aerobic, muscle-strengthening, and bone-strengthening exercise. Bone-strengthening activities include running, hopping, or jumping, while climbing or push-ups are muscle-strengthening. At vigorous intensity, children can only say a few words without pausing for a breath.