Chris Hemsworth dropped 33 pounds in four weeks for his role in the 2015 survival-drama "In the Heart of the Sea," which is based on the real-life story that inspired Herman Melville's novel "Moby Dick."
But don't expect the Australian actor, who's well-known for his role as the divinely fit Avenger Thor, to lose that kind of weight again for a role -- ever!
"I don't think I'd lose it again, no, because it's just too exhausting," the 32-year-old father of three told Wonderwall.com at a press junket for his film "The Huntsman: Winter's War" at Universal Studios Hollywood in April 2016.
"There are smarter ways of doing it now, I think, camera trickery and so on," he added.
Hey, it worked for Marvel's other buff Chris (Evans), who -- with a little CGI help and some expert staging -- portrayed a frail pre-Cap Steve Rogers in "Captain America: The First Avenger" in 2011.
Like most people, Liam Hemsworth's big bro finds the act of losing weight to be much more challenging than the process of putting it on.
"I don't mind going up to Thor weight and then going back down to my normal body weight," he told us. "It's easier to put it on than it is to take it off."
"It gets harder each time once you put on that mass," he added. "Your body's like, 'Nah, it's staying here.'"
"And it's not very much fun to not eat," he concluded.
Chris certainly knows a thing or two about that!
In 2013, he dropped from around 215 to 175 pounds while shooting "In the Heart of the Sea" -- in which he portrays the first mate of a whaling ship who's stranded at sea for 90 days along with his crew after they're shipwrecked by a whale -- by consuming between just 500 and 700 calories a day. (That's about the equivalent of a plain bagel with one 3-ounce packet of plain cream cheese.)
"We have to shoot the really skinny stuff where we drop down to 500, 600, 700 calories a day, a good three or four weeks and it's going to be pretty uncomfortable, but we'll be together in our misery," Chris told "Entertainment Tonight" in late 2013 when they visited him on the film's set.
"I spend more time thinking about food than anything else at the moment," he added at the time.
In November 2015, our favorite Avenger promoted the Ron Howard-directed film by sharing a throwback photo of his "In the Heart of the Sea" transformation on Instagram.
"Just tried a new diet/training program called 'Lost At Sea'. Wouldn't recommend it.. #IntheHeartoftheSea @zocothebodypro," he joked in the caption of a photo of himself looking tanned and thin (with the help of some stage makeup, of course!) with a long beard and straggly hair.
In "The Huntsman: Winter's War," Chris is somewhere comfortably in the middle of his "In the Heart of the Sea" size and his Thor girth -- and that's just where we like him!
"The Huntsman: Winter's War" debuts on April 22, 2016.