The answer is it depends on what animates them in the first place. If it is temporal then usually the virus can sustain some bodily functions like in The Walking Dead. If it’s spiritual then they can be walking skeletons like in Army Of Darkness.
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Fun fact: muscles tear when under pressure. When you work out, you tear your own muscles, they will grow stronger and it’s a good thing. Zombies can’t grow new tissue, they would walk for a few days/weeks and their muscles and tissue would be gone.
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