Looking Good!J.K. Simmons Undergoes a Major Body Transformation for New ‘Justice League’ Role

Check out those guns!

J.K. Simmons, 61, has undergone a drastic body transformation for his upcoming role in Justice League — and we can't get over how unrecognizable he looks in a new pic shared by his personal trainer!

“Everytime we train together I forget he’s 61-years-old,” Aaron Williamson captioned a pic of the actor impressively doing bicep curls on Thursday, June 2. “So much respect for this guy. #JKSimmons #OldManCranking.”

RELATED: Watch Jimmy Fallon, J.K. Simmons, and Billy Joel Spontaneously Break Into Song on The Tonight Show!

J.K. will portray Batman's fit friend, Commissioner James Gordon, in the blockbuster, set to hit theaters in November 2017. The movie also stars Ben Affleck, Amy Adams and Amber Heard, to name a few.

Click through the gallery below to see more stars who’ve transformed themselves for film roles!