Which of the following is not an effective way to prevent heat stress and stroke?
A. Take a 10-minute rest for every 45 minutes of activity.
B. Wear loose-fitting clothing that allows sweat to evaporate.
C. Wear a minimum of SPF 15 sunscreen.
D. Drink water before, during, and after a workout.

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.