Explain why a person who spends most of the day on his/her feet is more likely to develop varicose veins.

It's because he/she is constantly subjecting their legs to gravity, which veins are fighting against to move blood back to the heart.

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.