the entire mental health hospital had a similar program (it was in oxford) even on the other none specialised wards did fintness classes and had a gym. its becoming commen practice within mental health.
some of the classes where ran by nurses (who were trainned in fitness, but only like NVQs. lol). there had to be at least 3 nurses in a class of 10 patients (we were all quite seriously ill so high supervision was needed). we even had a 30min dance class once a week with was ran by a therapist which was awsome
.
basically they were trainned health professionals and they had fitness hobbies, they took NVQs and incorporated that hobby into their work.
mental health requiers alot of imagination, you have to help in a unique way and in many different way to make sure the patient has alot of different ways of coping with their stresses.
i also started a community mental health fitness group (after i was discharged from the hospital). a guy who was a fitness instructor ran it along with a few mental health nurses and they arranged physical activities for mentally ill people. it was great, they had a load of funding and we did things like hiking, rock climbing and swimming. i know that for me it did really help my mental health and it increased my mood a lot.
what you want to do
is possible in the mental health world. my advice would be while trainning to be a MH nurse take a few fitness classes on the side and really decide on what area of fitness interests you, then when you are finished nurse trainning do an NVQ (NVQs are so easy) in fitness teaching then you will be able to apply your fitness knowlege to the way you help people recover.
i think you have a really good idea going there.