What is the best way to maintain a healthy body composition?
eat more empty calories
get regular exercise
skip a meal each day
stick to a low fat diet

true child development specifically

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.