Wentworth: It's hard to establish an exercise regime given the hours we work. Plus, I made the decision that my character, Michael, wasn't going to be particularly built, that the only thing he had going for him was his smarts. So that he was, in fact, physically vulnerable. I let Dominic Purcell bear the brunt of the big action-hero, muscle-bound thing. Michael can continue to be the brains of the situation.