I would strongly bet against gym rats not having some shoulder abnormality. If anything, I'd expect them to have more issues with their tendons and ligaments.

More likely someone who's been in a coma for the last ten years.

They'd probably have to specifically focus on mobility and flexibility as well. You really need both of those in conjunction with enough strength.

Gymnasts are known to have very worn out shoulders which can be seen in scans. Eg at ~25yo they have shoulders of a ~40 to 50 year old person.