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I read from websites and articles that exercise will make your heart stronger thus your heart will use less effort to pump blood around the body per heartbeat thus reduce risk of CVD. However, how exactly does the idea of pumping blood with less effort around the blood reduce risk of CVD? Even though a weaker heart have to use more effort to pump blood (perhaps requiring more energy), the net effect must be that enough blood reach all the cells around the body.

I've heard that a stronger heart reduces blood pressure (thereby reducing risk of CVD due to endothelial damage). But I'm not sure if that logic follows as a stronger heart can pump harder which would mean that the blood pumped is of higher pressure.

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