How J.K. Simmons Got Ripped To Play Commissioner Gordon

J.K. Simmons is best known for playing news tycoon J. Jonah Jameson in Sam Raimi's "Spider-Man" trilogy and an alternate version of the character in the MCU's "Spider-Man" entries. But like many other stars, Simmons crossed the great divide from Marvel to DC, portraying the iconic Gotham Police Commissioner James "Jim" Gordon in the DCEU's "Justice League." In 2016, Simmons told Collider how excited he was to be playing a character he'd grown up seeing on the big screen. However, he chose not to revisit past performances — by the likes of Gary Oldman and Pat Hingle — prior to taking on the role so he could give it his own spin. "I'm just planning on learning as much as I can about him through the comics and getting my feet wet in the first movie, and then hopefully continuing on from there," he said.

Simmons was set to showcase a different side of the character in HBO Max's now-canceled "Batgirl" feature. "It's really more a story about him as a guy and as a father and not just about the guy who's turning on the Bat Signal and trying to keep the citizens of Gotham safe," he told A.frame. "It was a chance to delve into a different aspect of the character."

Although playing the commissioner didn't require him to get fit, Simmons is absolutely ripped when he appears in "Justice League," and photos of the actor on the set of "Batgirl" show an equally impressive physique. Keep reading to find out about Simmons' intense fitness regime and how and why he got ripped to play Commissioner Gordon.

It's not a big surprise that J.K. Simmons' ripped physique is the result of him working with a trainer. Aaron Williamson is a former marine, bodybuilder, and fitness trainer known for working with Hollywood actors like Dwayne Johnson and Zac Efron.

Williamson struggled when he returned from Iraq in 2009, so he turned to fitness, something he'd always been passionate about. "My fitness was the only thing that helped me keep my sanity," he told Men's Health. He soon found a way to turn his passion into a career, too. "I started training at this 24-hour gym in New Orleans and ended up discovering there were more TV shows and films being shot in Louisiana than anywhere else in the world at that time." This is how he met Simmons in 2015.

Simmons was filming "Terminator Genisys" in Louisiana, while Williamson had a small role in the film and was working on set as the fitness coordinator. "I just had free time to go to the gym, so I started training with him," Simmons told Business Insider. Their relationship just developed from there as Simmons became more interested in fitness. He still trains regularly with Williamson, who has since relocated to LA.

While speaking about his fitness regimen to Business Insider, J.K. Simmons broke down exactly how he created and maintains his chiseled physique, as seen in "Justice League." "I've gone back and forth with fine-tuning the kind of conditioning I'm doing," the "Whiplash" actor said. "Sometimes trying to shed weight and getting leaner and sometimes trying to pack on a little more muscle."

Aaron Williamson told The Hollywood Reporter that his and Dana Perri's methods complement each other, allowing Simmons to lose weight and pack on muscle while maintaining a rigorous lean, low-carb diet. In an interview with Men's Journal, Williamson detailed the kinds of workouts that he'll do with the actor. He noted that Simmons' weight training often includes dumbbells, presses, and pulldowns to work his chest, back, and abdominal muscles, followed by curls, kickbacks, and bodyweight exercises for arms and abs work. He does these as supersets, which are back-to-back exercises, meaning there are minimal to no breaks between them.

Simmons was already training with Dana Perri when he met Aaron Williamson. At that time, it was still early days in his renewed fitness journey and he was just taking small steps toward his goal of losing weight and building muscle. 2009 was a turning point for Simmons, when the "Juno" actor says he started thinking about his health and physical fitness more seriously. "After the second and final time that I got hugely fat in my life and when I lost that weight six or seven years ago, I pretty much decided that I was going to stay in decent shape for the rest of my life," the actor told Business Insider.

Working out with Williamson in Louisiana began as part of that lifestyle J.K. Simmons was trying to live. (And he's far from the only Hollywood star to put their money into exercise, training, and dieting to get the physique of a superhero.) "He wanted to get into the best shape he had ever been in," Williamson told Men's Journal. "J.K.'s goal was to adopt a healthy lifestyle and never have to worry again about health issues."

It's a basic fitness rule that you can't out-train a bad diet; exercise and nutrition go hand-in-hand. J.K. Simmons has learned this lesson over the years, making sure to use food to aid his fitness goals. "He's been experimenting over the past couple of years with different foods. A lot of low-carb stuff, lean proteins, a lot of vegetables," trainer Aaron Williamson told The Hollywood Reporter.

Like his training, he needs variety, though. "Every day might be a little different for him," Williamson said, hinting that Simmons doesn't have as fastidious a diet as Chris Evans or Chris Hemsworth at the height of their Marvel careers. However, one thing that never changes is how regularly Simmons eats. According to his trainer, it's every three hours like clockwork, prioritizing proteins and veggies, like eggs, chicken breasts, lean steaks, and plenty of greens.

Most people doing the level of training Simmons has become accustomed to find the need to break up their healthy lifestyles once in a while. For some, it may come in the form of a few too many alcoholic drinks one evening. For others, like The Rock, a no-holds-barred cheat day may be in order.

While Dwayne Johnson's "Red One" costar and fellow DCEU actor, J.K. Simmons, might not have glorious cheat days when he orders trays of sushi and eats banana chocolate chip pancakes — that we know of, anyway — the "Tomorrow War" actor has a small luxury up his sleeve. "What he calls his 'secret weapon' is a little piece of dark chocolate," trainer Aaron Williamson said to The Hollywood Reporter. "He eats one square every day. ... Just a good, high-quality piece of dark chocolate." According to the trainer, Simmons has always got dessert sorted because he takes some with him whenever he eats out. He always shares, though, Williamson added. It's way more nutritious than most cheat meals, but clearly it works for Simmons. Williamson is totally on board with Simmons' "secret weapon": "I say go for it. There's a point that if you don't cheat, your metabolism will actually stall out," he explained.