I would imagine it would be a pretty good thing if we never tired out, even if it meant we weren’t quite as strong, or had to compromise elsewhere.
So why aren’t ALL our muscles the same way as the ones in our heart, where they’ll just keep working without aches, power loss or even all-out cramps and failure when they’re working hard?
Also, I do understand that even heart muscles can break down, e.g. in a heart attack, but we never get “heart cramps” even if we exercise all our other muscles to their limits and our heart is still working normally.
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There’s a joke of a question “If the black box in a plane is indestructible, why isn’t the whole plane made out of a black box?” – it’s funny, but the realistic answer is that the plane won’t fly.
Your heart muscle doesn’t repair well, it takes a while to grow and your body prioritizes it above almost everything else for oxygen and nutrition. In contrast, your leg muscles repair fairly quickly, can grow with use if your lifestyle demands stronger legs, but can also shrink to conserve caloric need if you don’t particularly need large legs. Your heart is also very dense muscle for it’s size and need. Think about how easily a surgeon can manually pump a heart to keep a person alive. Imagine all those resources for that amount of strength?
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