Federal guidelines recommend that children perform a vigorous workout at least three days a week. Which activity would meet this goal? sprinting fast around the school track
walking casually with friends to school
floating in the pool before swimming class
stretching as part of an exercise warm-up routine

sprinting fast around the school track

Explanation:

The question is asking for a "vigorous" workout. The word "vigorous" is a context clue that means the answer should include something challenging or fast or having a high-intensity.

Among the choices mentioned, it is only "sprinting fast around the school track" that is vigorous because this exercise helps increase your heart rate. All the other choices such as walking casually, floating in the pool or stretching are low-intensity exercises.

cutting out negative people, changing their diets, exercising, taking off days from work or school, etc