but after shooting wrapped Simmons felt he was ready for a full-body change. "He wanted to get into the best shape he had ever been in," Williamson says, adding, "J.K.'s goal was to adopt a ...

J.K. Simmons ... came out and I just thought, 'Wow, I don't believe this guy at all. I have to get my a– to the gym and be a believable hard-a–.' " RELATED VIDEO: Billy Joel, J.K. Simmons ...