Maybe Assist Mode in Mario Odyssey is how things are normally for Mario, so the ground pounds hurt, but he's fine after he rests for a bit because of some kind of superhuman healing factor (maybe the same one that lets Link heal from near death in Breath of the Wild by sleeping in a regular bed)
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I mean yeah that could never work irl smh.
(Surely a piece of cake once you've mastered the backflip!)