Humans , and many other animals/mammals, were made to RUN. Like all day. Like all week like all your life your body was made to run run run. We were definitely not made to stand, evolutionarily speaking that is. You are using muscles that your mind has other ideas for and your brain is telling you to do something else. Or if you want to use big words to sound sciencey we could say the motor outputs are not receiving enough stimulation from the mind’s motivational centers (think the Pallidus and Striatum) to continue standing there and doing tasks with no immediate rewards.
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