Which is the best aerobic exercise plan? A. 15 minutes to warm up, 15 minutes of aerobic activity, 15 minutes to cool down B. 5 minutes to warm up, 25 minutes of aerobic activity, 0 minutes to cool down C. 0 minutes to warm up, 15 minutes of aerobic activity, and 15 minutes to cool down D. 5 minutes to warm up, 20 minutes of aerobic activity, 5 minutes to cool down Reset Next

D) 5 minutes to warm up, 20 minutes of aerobic activity, 5 minutes to cool down

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.