How much physical activity should an adult have each week?
A. 60 minutes per day, 7 days a week
B. 30 minutes per day, 7 days
C. 60 minutes per day, 5 days a week
D. 30 minutes per day, 5 days a week

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.