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The heart doesn't have to work as heard to circulate blood throughout the body because the arteries (pathway for blood) are clearer and there is less blockage. Unfit people usually have arteriosclerosis (hardening of the arteries) and atherosclerosis (accumulation of plaque); both of these make it harder for blood to move about the body, forcing the heart to work harder by pumping faster.

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15y ago

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