Olympic athletes have lower resting heart rates because
Athey exercise regularly, which improves the efficiency of their heart.
Bthey tend to eat low-fat diets.
Cthey have a lot of muscle mass due to weightlifting.
Dtheir lungs tend to be naturally larger.
Athey exercise regularly, which improves the efficiency of their heart.
Bthey tend to eat low-fat diets.
Cthey have a lot of muscle mass due to weightlifting.
Dtheir lungs tend to be naturally larger.
