EXCLUSIVE: JK Simmons on 'Justice League' and Those Buff Gym Pics: I Don't Want to 'Turn Into a Fat Piece of P

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If you're expecting Justice League to be the J.K. Simmons gun show, you may leave just as disappointed as Batman v Superman.

The 61-year-old actor's personal trainer recently shared some pictures of Simmons looking super jacked, but when ET caught up with the Oscar winner at the 2016 MLB All-Star Legends & Celebrity Softball Game, he revealed that he's not bulking up to play Commissioner Gordon.

"The going to the gym, honestly, had nothing to do with Commissioner Gordon," he told ET's Brice Sander during batting practice. "I've just been going to the gym off and on my whole life -- but the last five or six years, I've been trying to just stay pretty dedicated and fight Father Time, and not to turn into a fat piece of poo again."

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Simmons previously admitted that stepping into the DC Cinematic Universe was "intimidating," but promised he would put his own twist on the iconic character. Now, he revealed that if he has his way, it'll be a badass twist.

"In the comics, he's a pretty tough guy. He's not just this comic relief," he explained. "In the first film that we're currently shooting [Justice League], my part is not as big as, knock wood, it will be in some of the future films...but the plan is if that there will be more Commissioner Gordon in the future. And I have absolutely no idea, zero idea, but I'm lobbying right now: let Commissioner Gordon be a badass."

Last time we saw Gotham City's police commissioner on the big screen, Gary Oldman was playing him in the Dark Knight trilogy. The 58-year-old actor told ET he was "absolutely happy" Simmons was taking over the role, but Simmons says he hasn't turned to Oldman for tips.

"I have not, although our kids have been in school together," he revealed. "Actors like to do their own thing. Gary Oldman is a great, great actor, and I think he was awesome as Commissioner Gordon, and I'm doing a different version."

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As for the MLB All-Star Legends & Celebrity Softball Game, which will air on ESPN on July 11, Simmons seemed to think it was just as intimidating as joining Batman and Superman onscreen.

"I will say that I am ready for this game. I will say that this glove is not ready for this game, because it's brand new and it's not broken in," he joked. "I'm saying it right now: I'm that guy. I have a built-in excuse. If the ball bounces off this brick that I'm wearing in my left hand, it's the glove's fault."

And though we may be forever impressed by the Whiplash star's gym pics, he wasn't about to flex on the field, not surrounded by the likes of Terry Crews and Morris Chestnut.

"I'm not gonna unveil my biceps in this crowd," he said with a laugh.

So, if Simmons is officially in the DC world, do we have to give up our dreams of seeing him reprise his Spider-Man role? Find out what he had to say in the video below!