Leave it alone for too long and it loses its form. It becomes emaciated, or shapeless, or blobbish. This is not ideal. Absolutely not recommended.
But spend too much time on it and it can cause an obsession that leads to grotesque outcomes. Overdone. Too far. Hard to watch.
What I'm trying to say is, exercise is great for everyone. Except you, extreme body builders. It's too much. Bring it down a thousand notches.