Submitted by CanGroundbreaking814 t3_ylgnyq in askscience
Ipresi t1_iuztw8y wrote
Reply to comment by coffee_collection in Why does resting heart rate lower as people get fitter? by CanGroundbreaking814
Your circulatory system also gets more efficient so blood can travel with less resistance. You get a better pump and plumbing so to speak.
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