The ultimate weight gain film has to be Raging Bull. Robert DeNiro first used weight equipment to become the slim, muscular boxer in the film. All of the boxing scenes and related scenes were shot first.

The second part of the film was shot several months later. During those months, DeNiro gained 60 pounds! The young boxer was transformed into the older, washed up boxer for the film. I certainly do not recommend this method for weight gain, but it would be nice for weight loss!