According to federal guidelines, what activity qualifies as a vigorous workout for children?

Vigorous physical activity for children is characterized by activities that significantly elevate the heart rate and require a greater effort compared to light or moderate activities. Sprinting fast around the school track fits this definition perfectly, as it involves high-intensity movement that not only promotes cardiovascular endurance but also engages multiple muscle groups, fostering overall fitness and health. This type of exercise is crucial for children's development, as it improves aerobic capacity and helps in building strength and coordination.

Other activities listed do not meet the criteria for vigorous workouts. Casual walking is a low-intensity activity, while stretching generally serves as a preparatory exercise rather than a vigorous workout. Floating in the pool, although it may be relaxing, does not contribute to a vigorous intensity associated with physical fitness. Thus, sprinting around the school track is the clear choice that aligns with federal guidelines for vigorous activity for children.