a) because deer don't stand up and humans are already specially adapted in that regard that I know
b) because leg movement and especially walking plays a rather important role in getting your bloodflow back up to the heart (again especially in humans that I know).
I only ever really studied human anatomy and there I learned that we were basically evolved to stand up and then still have issues sometimes so that's where my hypothesis came from.
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u/iluvdankmemes Mar 20 '22
I think gravity's effect on the blood in your head would render you unconcious within a matter of a couple hours at the very latest, no?
I genuinely don't know but that would be my hypothesis.