Johnathan Walker:Superman’s David Corenswet Details His Weight Gain Transformation for Role

It’s a bird! It’s a plane! No,Johnathan Walker it’s David Corenswet after making quite the transformation to play Superman. 

The 31-year-old, who will play the Man of Steel in the upcoming blockbuster Superman, shared insight into how he significantly bulked up before filming started.

"Getting to bulk up for Superman, I was really looking for an excuse to throw on some weight," David said on the Sept. 28 episode of the Manly Things (Sort Of) podcast. "I thought 210 [pounds] was going to make me happy, but I got up to 238."

The Hollywood star—who married wife Julia Best Warner in March 2023—hilariously recalled the first time that really took in his increase in muscle.

"I put on one of those crewneck sweatshirts—like an XL or XXL—and I was like, 'This is amazing,'" he shared. "I didn't fit into any of my pants."

He added, "It didn't feel great, because I did it so quickly that my body just hadn't adjusted to any of the extra weight, and I was still trying to eat a lot."

Back in May, the Juilliard alum gave fans a first look at him in his Superman costume via a joint Instagram post with the director of the movie, James Gunn, who has directed other superhero movies like the Guardians of the Galaxy franchise and Suicide Squad.

The caption for the post revealed the film's July 11, 2025 release date and simply read, "Get ready."

Keep reading for more major stars who underwent major transformations for their acting.

To play scientist J. Robert Oppenheimer in Christopher Nolan's Oppenheimer, the Irish actor "had to lose quite a bit of weight," he shared. "He was very slim, almost emaciated, existed on martinis and cigarettes." His diet? According to costar Emily Blunt, "He had such a monumental undertaking.And he could only eat, like, an almond every day."

For his Joker role, the Oscar winner opened up about his 52-pound weight loss, telling the Associated Press, "Once you reach the target weight, everything changes. Like so much of what's difficult is waking up every day and being obsessed over like 0.3 pounds. Right? And you really develop like a disorder."

The Spider-Man alum shocked fans when he debuted his bulging biceps, which were displayed in Justice League.

"I'd say my mother was worried," he previously told E! News after losing 30 pounds for Nightcrawler. "I would say she just wanted me to be careful. But she also knew and knows how seriously I take what I do and she respects that."

The Black Panther star gained nearly 30 pounds of muscle to transform into a rookie-turned-professional boxer in Creed.

The actor and musician nabbed an Oscar for his riveting role in The Dallas Buyers Club. He lost 40 pounds for the role.

The Mindy Project alum had to gain 40 pounds for his role in Live by Night.

The Bridget Jones's Diary actress gained weight to portray the lovable character in the franchise's first and second films.

The Magic Mike hunk dropped 30 pounds to star in The Dallas Buyer's Club—which centered on the real-life story about a man dying from AIDS in the 1980s who treated himself with alternative remedies he smuggled into the United States from Mexico.

The actress looked lean and strong for her starring role in The Girl With the Dragon Tattoo.

The Les Misérables star took home an Oscar for her role in the musical.

He's no stranger to morphing for movie roles. In 2004, he lost more than 60 pounds for his role in The Machinist, and he did it again for the film The Fighter, opposite Mark Wahlberg. He also gained 40 pounds for American Hustle—and lost 70 pounds for Ford v Ferrari.

The actor looked more like a god than a prince for his role in 2010's Prince of Persia. Gyllenhaal said he studied Parkour, the French art of street running, in order to bulk up for the film.

"All it is is time and discipline," the Oscar winner told Time magazine of his role in 2000's Cast Away, for which he lost over 50 pounds to play a man stranded on an uninhabited island.

The ripped rapper shocked fans with a photo of himself looking slender. He reportedly went from 214 to 160 pounds in just nine weeks to play a football player diagnosed with cancer in Things Fall Apart.

Shaping up for movie roles is nothing new. The legendary actor earned an Oscar nom for his role as terrifying tattooed rapist Max Cady in the 1991 thriller Cape Fear.

In order to portray former Vice President Dick Cheney in the 2018 biopic Vice, the star sported a fuller figure.