Exercise is the perfect treatment for mental health: it doesn't cost the "provider" anything, and when the patient doesn't do it because they're depressed or disordered, you can blame them for not cooperating. It's not a solution, it's something you can say so that it's not your problem any more.

(Would be great if there were actually prescribed work-compatible supervised exercise sessions on offer, but AFAIK that's not a thing offered anywhere by any health service)