system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Can Superman have a skinny guy physique or is it impossible for him to NOT have Arnold Schwarzenegger-like chest and arms?

and besides the Flashpoint story where they keep supes locked up away from the sun, is there any depiction of Superman with a lithe skinny body?  (superboy etc don’t count)
gpt
I am not aware of any other depictions of a skinny Superman (though it is quite possible that they exist).

But the Flashpoint story does show how it would be possible.  Superman doesn't get his physique from exercise.    Just the logistics of trying to find weights to workout makes it nearly impossible.  He would have to push planets around to get any actual gains.

Instead his build comes from what is essentially super nutrition he receives from the Sun.  So, as long as he was raised under a yellow Sun, he is going to be built like a fridge.  (Though this does raise the question of why Supergirl is so lithe, but that is a question for another day).