Chris Hemsworth recently showed his fans just how skinny he became while filming Ron Howard’s historical thriller In the Heart of the Sea.

Chris Hemsworth’s Weight Loss

Hemsworth caused a stir on Twitter earlier this week when he tweeted out a picture of himself looking noticeably slimmer and with a straggly beard that drew comparisons to Tom Hanks in Castaway.

“Just tried a new diet/training program called ‘Lost At Sea,'” Hemsworth captioned the picture. “Wouldn’t recommend it.. #IntheHeartoftheSea”

Over the summer, Hemsworth admitted that cutting the weight for In the Heart of the Sea proved difficult. Making matters particularly hard for the Thor star is that he had recently slimmed down for Michael Mann‘s thriller Black Hat.

“When I started, I was leaner than my Thor weight, anyway, because I’d been on Michael’s film,” Hemsworth told Entertainment Weekly at the time. “When you’re already starting off lean, it’s brutal to chew through that kind of weight. Every pound feels like a kilogram.”

“We kind of went insane, weighing ourselves every day,” Hemsworth added. “We all felt like a bunch of supermodels, trying to get down in weight for a show, or something. That’s all we spoke about. You’ve got 15 burly blokes on the sea and all we talked about was our diet, and who’d lost more weight, and who’s looking really skinny. It’s ridiculous!”

Howard, who admired the dedication of Hemsworth, Cillian Murphy, Benjamin Walker and the other actors in the movie for their dedication, revealed that not only were they fasting, they were also working out constantly to get the right bodies for the movie.

“They had to work out every day, even on shooting days. Because they had to lose the weight pretty fast and they had to lose it safely,” Howard told EW. “They needed to keep burning the calories and we also needed that sinewy strength that was more of that era, as opposed to a kind of cut, buff look.”

In the Heart of the Sea hits theaters Dec. 11.

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