1 / 15

Chris Hemsworth, ‘In the Heart of the Sea’

Hemsworth isn’t new to shedding weight (see: Black Hat and Rush) and regaining it (to play Avenger Thor), but In the Heart of the Sea represents his most extreme example so far. The 32-year-old Aussie reportedly lost 33 pounds in four weeks to play a 19th-century seaman in the Ron Howard film. (Photo: WireImage/Instagram)

Actors Who Have Radically Reshaped for Roles

As Chris Hemsworth’s shockingly slimmed-down physique takes center stage in the seafaring survivalist tale In the Heart of the Sea — in theaters Friday — we gathered together other actors who dramatically transformed their bodies for a movie role. Click through to see the results.