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J.K. Simmons INSANELY JACKED ... For New 'Justice League' Flick

6/8/2016 6:38 AM PDT

J.K. Simmons: INSANELY JACKED ... For New 'Justice League' Flick

Well, now we know what the J in J.K. Simmons stands for -- JACKED. 

Check out the 61-year-old beasting out in an L.A. gym -- gearing up for his role in the upcoming 'Justice League' movie. 

No, he's not playing Bane ... or Batman ... he's an insanely muscle-bound Commissioner Gordon!

Simmons has been training with retired Marine Aaron Williamson -- who reportedly got Zac Efron into shape ... and who's been known to push weights with The Rock

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