How did she get that body?

Jennifer Lawrence has carried The Hunger Games to a fantastic box office weekend, the new movie scored a whopping $155 million in estimated box office receipts in its opening weekend.

How did she get that body? The old-fashioned way by a good diet and lots of working out.

Celebuzz talked with Jennifer's trainer, Joe Horrigan, and the Q&A is below, courtesy of Celebuzz.

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When you got involved with the film, what was your first task?

"I was called to help Jennifer prepare for the film by director Gary Ross. Gary and Jennifer had discussed Katniss, her appearance and what the character would be like. They came to a conclusion that Jennifer, who was already in good shape, should be leaner, but they didn’t think that she should be gaunt because she is able to eat in the book version."

Did you have her on any strict diet to go along with this?

"We had a certified clinical nutritionist look at the diet and it need very little modification. But we had a new goal so a little modification was necessary. She was very happy that it wasn’t strict, fanatic or excessive. She said “I can do this.” And she did. She stuck to the diet and she didn’t cheat and was never late for a workout. She never complained and was very humble. I think she was looking forward to this film and this role so much, that she never took it as a chore. She was always upbeat. She said it was her privilege to do this and it reflected in her work."

Was the diet high protein, low in carbs?

"The calories had to come down. There had to be a cap and we tried to use a food service that could deliver the calorie range that were looking for. And our nutritionist talked to the group and we reduced the saturated fats. She had to have enough carbs to train. If you put her on too low of card diet then she wouldn’t have the energy and would affect her ability to perform."

Do you know what the range was?

I don’t have that right in front of me. But it was very reasonable [...] She already looked good. We just needed to take her down a little bit.

(Image: WENN)