I think there might be less violence in prisons if they work these people from dawn to dusk 6 days a week, and yes, physically exhaust them on a daily basis. No more weight rooms, just work work work. And when it's time for lights out, they'll sleep instead of fight. (And of course I must add, people who are physically capable of working)
I agree. Work and study. Learn a legitimate trade. No more hanging in the yard cooking up schemes in the California sunshine. No more getting buff in the weight rooms. Prison should be a distasteful experience yet offer the opportunity for genuine self improvement.