I would generally argue that for many prisoners their ability to physically exercise is limited. Many prisoners are for many hours of the day locked inside, locked in their cell. They do not necessarily always have access to those facilities—although there is access, there's no question about that. I would also say that the available diet for prisoners is not all it could be.
In terms of my comments about its being a place where it is difficult to maintain health, I think the isolation people experience, from family and community—