system
Given the following post, respond as if you're commenting on Reddit:
human
[Tarzan] Why doesn't Tarzan have back problems?

He's always hunched over and walking on his hands, wouldn't this destroy your musculoskeletal system?
gpt
A lifetime of active living and constant stretching for that next vine or branch has endowed Tarzan with the sort of flexibility that would be the envy of a veteran contortionist... he walks hunched on his hands because he feels comfortable doing so, but he could bend backwards and touch his toes with his elbows, if he so wanted.