Why is it healthy to strain your heart through exercise, but unhealthy to strain it through stress, caffeine, nicotine etc? What is the difference between these kinds of cardiac strain?
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Exercise is like stretching a balloon prior to blowing into it. You’re maintaining its elasticity. Chronic stress on the heart is like inflating the balloon fully for a month then deflating it back down – it’ll deflate down to twice the size it started, with all the elasticity gone. That is heart failure.
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