8. Russel Crowe
Russel Crowe is one of those celebrated actors who is known for regular body transformations to meet the requirements of his roles. While Gladiator was one his biggest achievements, there are other roles, including his 2017 movie Nice Guys, where he has gained as much as 40 lbs to portray his character in the best possible light. Crowe basically added the extra weight by spending 3 months eating lots of junk food while doing away with workout sessions. With his age tripping over 50, Crowe does not seem too eager to play any more roles where he has to be overweight as shedding those extra pounds is getting more and more difficult.