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We see the result of their perfectly sculpted bodies and gawk over their incredible physiques whenever they appear on the big screen. But are our most praised actors and actresses solely responsible for the rigorous training that goes into their bodies? A little motivation goes a long way, and when you have some of Hollywood's Top Celebrity Personal Trainers working behind the scenes, you can expect nothing but the best outcomes. And these aren't your everyday personal trainer at the gym. These fitness gurus are experts in the field of fitness, nutrition, and inspiration to keep celebrities on their A-game.

Aaron Williamson

Aaron's success story is one that provides great inspiration, so it's no wonder that he has channeled that inspiration into his Fitness Training Business and is now motivating celebrities to never quit and get in the best shape of their lives. Aaron Williamson launched his Fitness Business in New Orleans in 2009 after serving two Tours of Duty as a U.S. Marine. He would then move out to Los Angeles, and seven years later, would be responsible for the training and conditioning of A-list celebrities like Sylvester Stallone, Dwayne "The Rock" Johnson, and Jamie Foxx. His success as a Fitness Trainer in the Hollywood Industry didn't come without hurdles, as the former Marine was at one point living out of his car. Currently, aside from training other celebs, he has appeared in series like "Purge."

Justin Gelband

He's been given the honorable title of "model whisperer" by the New York Times for his sought-after ability to get even the long-legged and limber in shape for their catwalks. Justin Gelband is the owner of the ModelFit fitness studio in Manhatten, where the established "supermodel trainer" trains almost all of the Victoria's Secret Angels. A few of the most celebrated names in the modeling industry, such as Chrissy Teigen, the wife of famous musician John Legend, Karlie Kloss, Irina Shaik, Martha Hunt, and Miranda Kurr, for starters. In addition to a cardio-based toning workout, he keeps the models on a strict diet of no sugar, no alcohol and is only allowed to consume carbs like brown rice and vegetables.

Tracy Anderson

As one of the leading ladies in the health and fitness industry, she is no stranger to being associated with the rich and famous. Her revolutionary workout regime, known as the Tracy Anderson Method, consists mainly of light weight lifting, dance-cardio, band workouts, and pilates. And it's no surprise that her signature workout routine includes dancing since that was her first choice of career profession. She segued into weight loss/fitness training after gaining 40 lbs in New York in pursuit of her professional dance career. Way to make the most out of a bad situation! Her effective fitness style has landed her clients such as Stacy Keibler, Molly Sims, Gwenyth Paltrow, Cameron Diaz, Madonna, and Jennifer Lopez.

Ross Dickerson

It's safe to say that Ross Dickerson didn't find the gym, but the gym found him. Born in the United States as a Texas native, he is the owner of DR Physique Limited, which entails unconventional workout plans and meal preps that don't focus too heavily on obsessive calorie counting and precise macro-nutrient intake. Rather, he focuses on organic eating and eschewing all forms of processed foods, which is reflected on his website, DR Physique Limited. He offers a monthly training and diet plan for both men and women. Although he isn't known for directly training celebrities, at nearly 2 million followers on Instagram, he is one of the top celebrity trainers in the industry.

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Jeanette Jenkins

With over 28 years of experience, Jeanette Jenkins comes highly recommended with a dynamic collection of the internationally recognized Hollywood Trainer DVD Collection consisting of a package of 18 DVDs. The American-born fitness coach is also the Founder and President of The Hollywood Trainer LLC and is the author of two books, Let's Bake a Cake, and It's My Birthday. It appears that she keeps her professional life and busy as her workout routines. Jenkins also has a healthy following on Instagram in addition to being the host of the Lifetime Television show: My Workout. Her list of extensive celebrity clientele includes Alicia Keys, P!nk, Nia Long, Amber Rose, Serena Williams, Kelly Rowland, and Simone Smith, among other top-tier Hollywood celebrities and musicians.

Gunnar Peterson

Gunnar Peterson is conveniently located in the heart of Beverly Hills, where he has easy access to all of Hollywood's rich and famous. He also boasts close to 30 years in the fitness industry with an impressive resume to prove his reliability. He was formerly the Director of Strength and Endurance for The Los Angeles Lakers and has also worked with the NHL, NFL, NLB, NCAA, and male and female professional boxers. His high-energy, dynamic workouts have landed him other A-list actor clientele like Hugh Jackman, Matthew McConaughey, Sylvester Stallone, and the members of the Kardashian family. The physical results of some of these actors show in their movies, so it's no mystery why Gunnar is one of the best in Hollywood.

Harley Pasternak

Harley Pasternak has earned his stripes as a personal fitness trainer. It has been reported the Canadian-American had a passion for fitness from as young as thirteen and, by the age of eighteen, had begun taking on his first set of clients only after completing his junior year at The University of Ontario. In addition to his reputation for intense fitness exercises, he is also a nutritionist and author of a few excellent diet plans and books, such as The Body Reset Diet Cookbook and The 5-Factor World Diet. He has trained superstar celebrities such as Jim Caviezel, John Mayer, Jessica Simpson, Halle Berry, Khloe Kardashian, and Rihanna, to name a few.

Kirk Myers

If you're a gym head who lives in New York and you've never heard of Dogpound Gym, then you must be living under a rock. Founder and CEO of Dogpound Gym, Kirk Myers, has a truly remarkable story of success and redemption. A younger version of Myers weighed 300 pounds, and the emotional distress he suffered as a result of an incapability to keep up physically with his peers caused him to turn to junk food for comfort. A combination of bad eating habits and an overweight frame almost cost him his life at 21, where he was found to have an enlarged heart. Fast forward a decade later and 125 pounds lighter, and Myers has trained the likes of Taylor Swift, Justin Bieber, Adam Levine, and High Jackman as well as a host of Victoria Secret models.

Don Brooks

Don Brooks, also known as Don-A-Matrix, has excelled as the go-to personal trainer for some of the busiest and most popular artists in the music and Hollywood Industry, such as Kanye West, Kim, Khloe, and Kourtney Kardashian. With a background in training NFL players, he carries out his client training like the four quarters of a football game. This is precisely where he adopted his signature "Matrix Method," in which he allows strategic rests and hydration breaks after an intense physical session with his clients, just like an actual football game. Other famous clients, he trains include the Jenner family, actor Josh Duhamel, and renowned musician Trey Songs.

Alex Fine

Long before his relationship and eventual marriage to the former girlfriend of Sean "Diddy" Combs, Cassandra "Cassie" Elizabeth Ventura, Alex Fine was already recognized as an elite personal trainer. His personal training tends to be very personal, inviting his clients to "move-in" temporarily to his Laurel Canyon home in Los Angeles. Before becoming a personal trainer, Alex was a professional bull-rider. He got his first big break working out with C.T. Fletcher, which is where the then 25-year old made numerous connections with high profile celebrities like Jennifer Aniston, Odelle Beckham Jr., Mike Lee, Charles Melton, and many other celebrities who have requested the nutritional and physical expertise of Alex Fine.

READ NEXT: 15 Ripped Celebrities We Would Want As Personal Trainers

Sources: Vanity Fair, GunnarPetterson.com, Business Insider, Origym, DickensonRoss.com