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Olympic athletes have lower resting heart rates because

A. their lungs tend to be naturally larger.
B. they exercise regularly, which improves the efficiency of their heart.
C. they have a lot of muscle mass due to weightlifting.
D. they tend to eat low-fat diets.

User Nate May
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1 Answer

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B for certain. Although C and D may apply to some athletes.
User Tanmoy Banerjee
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