Photo: Reuters

Jennifer Lawrence famously called herself an “obese,” “fat actress,” claimed that she doesn’t diet, loves junk food and has been told to lose weight for a role. She’s also said “nothing can motivate me [to work out].”

It turns out it was all a lie: The 23-year-old “Hunger Games” actress exercised quite a bit to prepare for her role as Katniss Everdeen, according to her personal trainer.

Dr. Joe Horrigan, a chiropractic sports medicine doctor who has trained actors for movies like “The Matrix” and “Charlie’s Angels,” revealed to Teen Vogue he was called to get Lawrence “in shape quickly” for her role in “The Hunger Games.”

"Jennifer was an utmost professional," Horrigan told Teen Vogue. "She was never late. She never missed a workout. She never complained. She did everything that was asked of her and she usually did so with a smile."

Horrigan said Lawrence’s fitness regimen is composed of five parts: cardio, strength training, yoga, routine and attitude.

For cardio, which promotes blood circulation as well as helping “stamina, endurance and overall health,” Lawrence reportedly chose “skipping.” Horrigan also recommended a five- to 10-minute warm-up before 20 minutes of high-intensity cardio, like "running, cycling (road, mountain, classes, or simply a regular stationary bike), or various aerobic classes such as dance classes and hiking.”

Lawrence also built up her muscles to play Katniss. As Horrigan said, the more muscle you have, the more calories you burn. He suggested a 20-minute high intensity routine of "bodyweight squats, push-ups and sit-ups” or jumping rope in a circuit. Circuit training is doing one exercise for 30 seconds before moving on to another.

Yoga was also a part of Lawrence’s workout plan on her off-days, to stretch, improve flexibility and relax her body between high-intensity workouts. Lawrence’s low-intensity yoga routine included sun salutations, reverse warriors, chair poses, planks and tree poses, according to Horrigan.

Another important part of Lawrence’s workout was staying consistent as well as alternating routines each day. Horrigan said mixing up a workout regimen keeps the body from “plateauing.” He suggested a four-day routine of cardio the first day, strength training the second, mixing both on the third day and yoga on the fourth.

Horrigan also said keeping a positive attitude about working out, like JLaw, will make it that much easier to achieve fitness goals.

Lawrence’s new attitude about working out may come as a surprise as the actress has gone on rants in the media about her poor eating habits and lack of motivation to work out.

In the December 2012 issue of Elle, Lawrence said she is “considered a fat actress” and “obese” for Hollywood standards. She also asserted that she eats “like a caveman” and would never lose weight for a role.

“I'm never going to starve myself for a part,” she said. “I keep waiting for that one role to come along that scares me enough into dieting, and it just can’t happen. I'm invincible.”

Lawrence also claimed to be eating junk food frequently while watching reality television in South African Marie Claire’s January 2013 edition.

"At the end of the day there's probably nothing that makes me feel better than junk food and reality TV,” she told the magazine.

She also dished on her bad eating habits in an interview with British tabloid The Sun in March 2013, admitting she doesn’t think of herself as “sexy.”

"The other day I had pizza for breakfast, buffalo wings for lunch and pizza for dinner," she told The Sun. "Probably my favorite food is a potato -- just a potato, because I like fries, boiled potatoes, mashed potatoes, baked potatoes."

In another interview with Harper’s Bazaar UK last October, Lawrence said she was “hurt” by Hollywood execs who called her “fat.”

“Somebody told me I was fat, that I was going to get fired if I didn't lose a certain amount of weight," Lawrence said. "They brought in pictures of me where I was basically naked, and told me to use them as motivation for my diet."

Most recently, she referred on the 2014 SAG Awards red carpet to having a fear of fat under her armpit she called “armpit vagina.”

But despite it all, Lawrence may have been lying to the media all along, now that her trainer has outed her for working out. Last December, the actress said would never work out, even for a role.

"Nothing can motivate me," she told InStyle magazine. "During 'Hunger Games,' when I was eating ungodly amounts, I used to tell myself, 'Stop eating, people are going to see this. This movie is going to be around forever.' But nope! I was like, I still want candy and I still want a hot dog! Then 'X-Men' started, and I thought, 'Oh definitely, I'll work out and diet.' But nope. Not me!"