Must-see: J.K. Simmons gets buff for 'Justice League' role in viral photos

Via @aaronvwilliamson / Instagram

J.K. Simmons is totally jacked.

The 61-year-old actor is currently getting in shape for his upcoming role as Commissioner Jim Gordon in Zack Snyder’s “Justice League.”

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Don't believe us? Get a load of these photos from Simmons' trainer, Aaron Williamson.

Williamson, a self-described “U.S. Marine, actor, fitness pro” is responsible for other great Hollywood bodies, including Zac Efron, Dwayne “The Rock” Johnson and Emilia Clarke.

He clearly knows what he’s doing.

(h/t UPROXX)