JK Simmons is 61 and super jacked -- see the pics!

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J.K. Simmons Is 61 and JACKED -- See the Pics!

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.

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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."

Every time we train together I forget he's 61 years old. So much respect for this guy. #JKSimmons #OldManCranking

A photo posted by Aaron Williamson (@aaronvwilliamson) on

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.

He's making me look bad. #JKSimmons #AintPlayinNoGames

A photo posted by Aaron Williamson (@aaronvwilliamson) on

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

Saturday morning, 61 years old & making the young generation jealous. This is what dedication looks like. #JKSimmons

A photo posted by Aaron Williamson (@aaronvwilliamson) on

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.

See more photos of JK Simmons:

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JK Simmons is 61 and super jacked -- see the pics!
HOLLYWOOD, CA - JUNE 05: Actor J.K. Simmons attends the premiere of 'Worlds Apart' at the 2016 LA Greek Film Festival at the Egyptian Theatre on June 5, 2016 in Hollywood, California. (Photo by Paul Archuleta/FilmMagic)
LATE NIGHT WITH SETH MEYERS -- Episode 360 -- Pictured: (l-r) Actor J.K. Simmons during an interview with host Seth Meyers on April 27, 2016 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo)
NEW YORK, NY - APRIL 26: Actor J.K. Simmons enters 'The Late Show With Stephen Colbert' taping at the Ed Sullivan Theater on April 26, 2016 in New York City. (Photo by Ray Tamarra/GC Images)
LOS ANGELES, CA - APRIL 13: Susan Sarandon and J.K. Simmons arrive to Sony Pictures Classics Los Angeles premiere of 'The Meddler' at Pacific Theatre at The Grove on April 13, 2016 in Los Angeles, California. (Photo by Randy Shropshire/Getty Images)
HOLLYWOOD, CA - FEBRUARY 28: Actress Alicia Vikander (R), winner of the Best Actress in a Supporting Role award for 'The Danish Girl,' poses with actor J.K. Simmons in the press room during the 88th Annual Academy Awards at Loews Hollywood Hotel on February 28, 2016 in Hollywood, California. (Photo by C Flanigan/FilmMagic)
SANTA MONICA, CA - FEBRUARY 27: Acor J.K. Simmons attends the 2016 Film Independent Spirit Awards on February 27, 2016 in Santa Monica, California. (Photo by Frazer Harrison/WireImage)
SANTA MONICA, CA - FEBRUARY 27: Actor J.K. Simmons attends the 2016 Film Independent Spirit Awards on February 27, 2016 in Santa Monica, California. (Photo by Jeff Kravitz/FilmMagic)
LOS ANGELES, CA - JANUARY 30: J.K. Simmons and Olivia Simmons arrives at the 22nd Annual Screen Actors Guild Awards at The Shrine Auditorium on January 30, 2016 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - JANUARY 29: Actor J.K. Simmons speaks onstage at the 66th Annual ACE Eddie Awards at The Beverly Hilton Hotel on January 29, 2016 in Beverly Hills, California. (Photo by Emma McIntyre/Getty Images)
HOLLYWOOD, CA - JANUARY 16: J.K. Simmons arrives at the Premiere Of 20th Century Fox's 'Kung Fu Panda 3' at TCL Chinese Theatre on January 16, 2016 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - JANUARY 16: (L-R) Producers Mireille Soria and Bonnie Arnold, director Jennifer Yuh, composer Hans Zimmer, actress Lucy Liu, producer Melissa Cobb, actors Dustin Hoffman and Angelina Jolie, writer Jonathan Aibel, Jeffrey Katzenberg, CEO of DreamWorks Animation, actor Jack Black, writer/producer Glenn Berger, director Alessandro Carloni and actors Bryan Cranston, Kate Hudson and J.K. Simmons attend the premiere of DreamWorks Animation and Twentieth Century Fox's 'Kung Fu Panda 3' at the TCL Chinese Theatre on January 16, 2016 in Hollywood, California. (Photo by Todd Williamson/Getty Images)
BEVERLY HILLS, CA - JANUARY 10: Actor J.K. Simmons (L) and Michelle Schumacher attend the 73rd Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 10, 2016 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - JANUARY 08: Actor J.K. Simmons appears on Opie Radio at SiriusXM Studios on January 8, 2016 in New York City. (Photo by Michael Loccisano/Getty Images)
NEW YORK, NY - JANUARY 07: Actor J.K. Simmons attends the AOL BUILD Series to discuss his new film 'Kung Fu Panda 3' at AOL Studios In New York on January 7, 2016 in New York City. (Photo by Mike Pont/WireImage)
NEW YORK, NY - JANUARY 07: Actor J.K. Simmons attends the AOL BUILD Series to discuss his new film 'Kung Fu Panda 3' at AOL Studios In New York on January 7, 2016 in New York City. (Photo by Mike Pont/WireImage)
LOS ANGELES, CA - SEPTEMBER 24: Actor J.K. Simmons attends the Sunshine Kids Foundation and LAPD host Young Cancer Patients with cast at the 'Major Crimes' set at Raleigh Studios on September 24, 2015 in Los Angeles, California. (Photo by Lilly Lawrence/WireImage)
TORONTO, ON - SEPTEMBER 14: J.K. Simmons arrives at 'The Meddler' premiere during the 2015 Toronto International Film Festival held at Princess of Wales Theatre on September 14, 2015 in Toronto, Canada. (Photo by Michael Tran/Getty Images)
HOLLYWOOD, CA - AUGUST 27: Actor J.K. Simmons attends a screening of 'Break Point' at TCL Chinese 6 Theatres on August 27, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
J.K. Simmons during Landmark Club Restaurant Opening & Richard Belzer's Birthday Party - September 23, 2000 at Landmark Club Restaurant in New York City, New York, United States. (Photo by Ron Galella/WireImage)
J.K. Simmons & wife Michelle during 'Spider-Man' Premiere at Mann Village in Westwood, California, United States. (Photo by SGranitz/WireImage)
JK Simmons and William H. Macy during Fox Searchlight Pictures presents the Los Angeles Premiere of 'Thank You For Smoking' at DGA in Hollywood, CA, United States. (Photo by E. Charbonneau/WireImage for Fox Searchlight Pictures)
Charles Barkley and J.K. Simmons 11064_537.JPG during 2006/2007 TBS and TNT Upfront - After Party at Madison Square Garden in New York City, New York, United States. (Photo by Theo Wargo/WireImage)
Actor J.K. Simmons arrives to the premiere of 'Rendition' at the Academy of Motion Pictures Arts and Sciences on October 10, 2007 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD - NOVEMBER 05: Actor Jason Bateman, director Jason Reitman, executive producer Daniel Dubiecki and actor J.K. Simmons attend the Centerpiece Gala 'Juno' after party during AFI FEST 2007 presented by Audi held at The LOFT at Arclight Cinemas on November 5, 2007 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)
Actor J.K. Simmons arrives at the 13th ANNUAL CRITICS' CHOICE AWARDS at the Santa Monica Civic Auditorium on January 7, 2008 in Santa Monica, California. (Photo by Jon Kopaloff/FilmMagic)
PARK CITY, UT - JANUARY 18: (L-R) Writer/director Lee Toland Krieger, actress Brittany Snow, actors Adam Scott, Alex Frost, and J.K. Simmons pose for a portrait during the 2009 Sundance Film Festival held at the Film Lounge Media Center on January 18, 2009 in Park City, Utah. (Photo by Jeff Vespa/WireImage)
LOS ANGELES, CA - SEPTEMBER 25: Christina Hendricks and J.K. Simmons attend The Rape Treatment Center's Annual Brunch Hosted By The Cast Of 'Mad Men' on September 25, 2011 in Los Angeles, California. (Photo by Todd Williamson/WireImage)
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"#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. To hear more, watch the video below.

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