Wahlberg Reveals How Criminal Past Influenced New Role

Actor discusses his new film, "Pain and Gain," and how he prepared for action flick.
3:53 | 04/15/13

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Transcript for Wahlberg Reveals How Criminal Past Influenced New Role
Well, mark wahlberg is starring in a new action comedy directed by michael bey, "pain and gain." Based on a story about body building personal trainers that learn the hard way that crime doesn't pay. Learn a lot. It's all business now. How many grams of protein do you eat? How are you fixed for a job now? Not good. Kind of hard when row got a record. I know. Don't feel real good when mickey d's tell us you you are not fit to work there. This is a script based on a true story that is so hard to belief that at one point, you everyone put up, this is still a true story. What did row thing when you saw the script. I said, there is no way this is real. I read the article that the script was based on. Then I saw the documentary that was made on it. I studied the crimes. These are horrible crime. Not only did they set out to kidnap for money, they ended up murdering people and the man who you portray is actually on death row along with a cohort. Yet, when you're watching the film, we mentioned it's a comedy, there is physical and verbal humor. How important was it to make the characters likable despite the horrible crime. It has a lot of humor in it. We never played anything for laughs. We tried to play it as realistic as possible. You can't help but laugh, they're so outrage. For me, it was a lot of fun. You're seeing the movie through the criminals' perspective. You're inside the mind of the criminals. It's interesting pip don't think you have seen it like that before. I don't think you're rooting for them to get away. But it's a train wreck that you can't stop walking. You all already have great bodies. But you were beefed up to the max. You gained over 50 pounds. 40-something. Thank god I was doing all the tests for my own supplement lines. I was able to use all the formulas. I was eating ten meels a day. What was the training like. Old school heavy weight lifting. I'm not as young as I used to be. A lot of ailments came back. You have an interesting story to bring to the table. One thing that your incarceration at age 17 had a huge effect on you. Did you channel some of that to play the character? Absolutely. Finally I'm using some of the real-life experience to portray aracters in the films. Those are things I will never forget. They're close in my mind. It's good to have real-life experience to draw on. Your story of massic success. Theirs, not. I think if they got incarcerated early on, they might not have made the decisions. Nothing comes without hard work. Congratulations in order. I want to say, last night, you AND seth MacFarlane took home an mtv movie award for best on-screen duo for "ted." Is there going to be a sequel? Yes. He's working on it. I had a great time working with him. It will be the first sequel i have made. It will be right after "transformers." How do you manage that with everything going on. And four kids? No night life. THE MOVIE IS OUT APRIL 26th. Just ahead, nick lachey with a special song.

This transcript has been automatically generated and may not be 100% accurate.

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