JK Simmons, 61, shows off buff body for new role

HOLLYWOOD, CA - FEBRUARY 28: Actor J. K. Simmons attends the 88th Annual Academy Awards at Hollywood & Highland Center on February 28, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images) (Getty)

J.K. Simmons, 61 and… swoll?

It's true! The Oscar winner has apparently been busy pumping iron at Gold's Gym, and recently released pics prove his workouts are definitely paying off.

WATCH: Amber Heard Confirms Her 'Aquaman' Role in 'Justice League'

Simmons' personal trainer, Aaron Williamson, has been documenting his fitness journey via Instagram. His most recent pic of the actor shows a buff Simmons showing off his insanely toned arms.

"Every time we train together I forget he's 61 years old," Williamson captioned it. "So much respect for this guy."

Last month, Williamson -- who also works with Dwayne "The Rock" Johnson, James Marsden and Jamie Foxx -- joked Simmons was starting to make him look bad in the gym.

WATCH: Amy Adams and Gal Gadot Are Excited About Amber Heard's 'Justice League' Casting

"Saturday morning, 61 years old & making the young generation jealous," he captioned another snap. "This is what dedication looks like."

Fans were quick to comment on Williamson's photos, with many noting that Simmons was probably hitting the gym hard for his role as Commissioner Gordon in the upcoming fantasy film, "Justice League," which also stars Amber Heard, Jason Momoa, Henry Cavill, Ben Affleck and Amy Adams.

Others joked that seeing these pics was enough motivation to start getting serious about their own diet and fitness plans.

"#Lifegoals, seriously man!" one user wrote. Another impressed fan commented, "I gotta get my sh*t together!"

Back in April, ET caught up with Simmons, where he admitted taking on the role as Commissioner Gordon felt "intimidating."

"You know, it's just another opportunity to see what I can do with a truly iconic character in that comic book world, which is a really fun place to go play," he said.

NEWS: J.K. Simmons Says Playing Commissioner Gordon in 'Justice League' Is 'Intimidating'

The legendary role was most recently played by Gary Oldman, and the 58-year-old actor couldn’t be happier with Simmons' casting. When ET chatted with Oldman at a press junket for "Criminal," he revealed he was "absolutely happy" to hear about Simmons taking on the character.

"I hope he's fantastic in it," Oldman added.