Ya, they will claim "muh perfect bloodwork" and "no issues", what I like to do is just point to the fatty waddle. Fat fucks up your gait badly. This has serious repercussions for your joints. They can never deny the waddle. Well I suppose they can deny it, but they know they have it. Then you can start in about how they can't do a pull up or run for even short distances. Hormonal problems, etc.