Megan Fox Flaunts Flat Abs in Bikini Top Selfie

Megan Fox did her part in steaming up social media this Labor Day weekend. The 35-year-old flaunted her flat abs and seriously toned legs on Monday, wearing a bikini top and mini skirt in a mirror selfie shared on her Instagram account. How does the mother-of-three keep herself in impeccable physical form? Read on to see 5 ways Megan Fox stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bikini Photos!

1. She Is a Harley Pasternak Devotee

Megan is one of the many celebrities part of Harley Pasternak’s pack. “After my second baby, I noticed that losing weight was much more difficult this time despite working out and counting calories,” she wrote in a testimonial on his website. The celeb health guru’s 5 Factor plan has helped everyone from Jessica Simpson to Ariana Grande get into the best shape of their lives. “Once I implemented the other three missing principles into my daily routine, I noticed an immediate result. I lost the remaining weight and felt leaner than I had prior to my first pregnancy.”

2. She Is Extremely Disciplined

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When it comes to her diet, Megan is very disciplined, especially when she is trying to lose weight. "I don't have splurge foods. I either do something or I don't do it at all, and I'm doing this right now, so I have no cheat days,” she dished to E! “But if I was going to cheat, I would probably go with pizza or cake."

3. She Avoids Processed Foods

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You won’t find Fox nibbling on anything made with white flour or sugar. "I cut out all sorts of breads and those sorts of carbohydrates. No crackers, no pretzels, no chips, anything unhealthy. The worst thing I put in my body is coffee once a day," she revealed to E!

4. She Sips on Smoothies

Megan is a big fan of drinking nutrients. Like many of Pasternak’s celebrity clients, she enjoys fueling up on smoothies. "Megan's favorite is the red smoothie, which is whatever berries are in season, Chai tea, a scoop of protein powder and little bit of almond milk," he told People.

5. She Circuit Trains

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Megan trains hard, opting for circuit training instead of just cardio. "I exercise really hard twice a week. That's what I do," she revealed to E! "I do bursts of cardio with really heavy, “a minimum five-minute cardio warm-up, a lower body sculpting exercise, an upper body toning exercise, then an abdominal sculpting exercise, and finally, a five minute cool down," he told People about what an average workout session for the star involves.

Megan Fox is back to work and flaunting her fabulous figure! The bombshell, who is currently filming Expendables 4, shared a mirror selfie on Thursday highlighting her svelte figure. In it, she wore an all-black look, including an ab-baring top and tight leather pants. How does the mother-of-three keep herself so fit? Read on to see 5 ways Megan Fox stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bikini Photos!

1. She Trains with Harley Pasternak

Megan Fox/Instagram

Megan relies on Harley Pasternak’s to kick her butt into shape. “After my second baby, I noticed that losing weight was much more difficult this time despite working out and counting calories,” she wrote on his website. She uses the health guru’s 5 Factor plan, which has helped everyone from Jessica Simpson to Ariana Grande get into the best shape of their lives. “Once I implemented the other three missing principles into my daily routine, I noticed an immediate result. I lost the remaining weight and felt leaner than I had prior to my first pregnancy.”

2. Her Diet Is Disciplined

Sean Zanni/Getty Images

Megan is very disciplined when it comes to her diet. "I don't have splurge foods. I either do something or I don't do it at all, and I'm doing this right now, so I have no cheat days,” she told E! “But if I was going to cheat, I would probably go with pizza or cake."

3. She Avoids Anything Processed

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Fox avoids eating anything made with white flour or sugar. "I cut out all sorts of breads and those sorts of carbohydrates. No crackers, no pretzels, no chips, anything unhealthy. The worst thing I put in my body is coffee once a day," she revealed to E!

4. She Loves Smoothies

Emma McIntyre/Getty Images

Megan fuels up on smoothies. "Megan's favorite is the red smoothie, which is whatever berries are in season, Chai tea, a scoop of protein powder and little bit of almond milk," Pasternak told People.

5. She Does Circuit Training

Megan relies on hardcore circuit training workouts. "I exercise really hard twice a week. That's what I do," she revealed to E! "I do bursts of cardio with really heavy, “a minimum five-minute cardio warm-up, a lower body sculpting exercise, an upper body toning exercise, then an abdominal sculpting exercise, and finally, a five minute cool down," Pasternak told People about what an average workout session for the star involves.