The actor portrays Superman in the rebooted superhero movie and loved the first stage of changing his physique in order to look convincing in the role, reported Contactmusic.
"The 'major bulking' phase came first and that was fun. That meant eating 5,000 calories a day. The best thing about that phase is that you're really strong and even though you don't look great, because you're carrying a lot of extra fat, you're always in a really good mood," he said.
However, having gained the weight, Cavill then had to lean down and transform it into muscle, which he admits wasn't as easy.