system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Is Superman strong enough to hurt himself?

Can he snap his own bones if he pushes hard enough or can he dislocate his joints if he pulls hard enough?

What's his durability like compared to his strength?
gpt
Imagine his ratio of strength to durability is set roughly in the same proportion as an average humans'. 

You can break your own fingers, but you can't break your own femur. He probably has that same range of ability.

Why? because it's the best balance of access to strength and maintenance of bodily structure. His body was evolved, like ours, to last for at least a century under a red sun. Bodies don't do that if they can tear themselves apart when the going gets tough.