Actress Olivia Munn trained for six hours a day for her role in the new X-Men movie.

The Mortdecai star, who plays Psylocke in X-Men: Apocalypse, admits she didn't like the idea of having to work out for the film, but when she began to train in martial arts and sword play she started to love the confidence her fight clubs gave her.

"The beginning of the movie I do look different," she told late night host Stephen Colbert on Thursday (14Jan16). "If you watch the movie from the beginning to my fight scene, I lost, like, 12 pounds, because when I started I was like, 'I'm the relateable actress, I can eat whatever...'

"But then I started training for, like, six or seven hours a day - martial arts and sword training - so that I could become as lethal as I could, and I needed to feel as confident as Psylocke as I could. So six or seven hours a day for, like, two months (I trained) and then I lost 12 pounds."

Olivia, who is dating buff sportsman Aaron Rodgers, admits she likes the way she feels now she has a toned physique: "I feel very strong and it's an awesome feeling."