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I am not sure they are still buff and lean.

In 1996, an amendment to an appropriations bill expressly prohibited the federal Bureau of Prisons from purchasing "training equipment for boxing, wrestling, judo, karate, or other martial art, or any bodybuilding or weightlifting equipment of any sort." Many states, including California, made the same decision, either by statute or policy. These days, whatever free weights you'd still find in U.S. prisons are decades old. (These are often chained to the walls, to deter thieves and prevent inmates from beating each other with barbells.)

http://www.slate.com/articles/news_and_politics/explainer/2011/05/do_prisoners_really_spend_all_their_time_lifting_weights.html

But I am sure having nothing to do all day but eat and sleep makes one bored and working out lifts the boredom.  Also, it helps to be big and bad when you are surrounded by violent men.