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

The answer would be sprinting fast around the school track

sprinting fast around the school track

Explanation:

Sprinting is a complete physical activity that is good for both body and mind. The practice that ensures better heart function, lowering blood pressure and bad cholesterol (LDL), improving bone density, more mood, current memory and ability to concentrate. So if you want children to perform vigorous exercise at least three days a week, sprinting fast around the school track.

i think the answer is d.