You see people who have been very heavy in their life who have taken that body, trimmed it down, firmed it up through discipline, exercise and being able to say no. Eating properly, that all comes into it.
I really believe the only way to stay healthy is to eat properly, get your rest and exercise. If you don't exercise and do the other two, I still don't think it's going to help you that much.
When I get my heart rate up, I get good exercise and I think it's good for a lot of things, plus it's not hurting my hips right now.