Why can’t we keep running forever? Why can’t we performs exercise indefinitely?
In: 1
With all things, energy in equals energy out.
We could have evolved to always operate where we spent all our energy as fast as we received it. But as an evolutionary advantage, our bodies learned to store energy, so that we could spend large amounts in bursts. This effectively makes us faster/stronger than we have any right to be, but we cannot maintain this peak level forever. But that does not matter, because most of the time you don’t need to be super fast/strong, just for that hour or two when you are hunting for your next meal.
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