World’s Strangest

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If the Heart Is a Muscle, Why Doesn’t It Get Tired?

Heart image via Shutterstock You’re on the weight bench. 18. 19. 20! You couldn’t lift that barbell again if someone had a gun to your head. Your arms and your chest are sizzling with a dull burn. Your muscles are fatigued, and as you try to put the bar back, your arms give out. Then there’s [...]