Our Favorite Celebrity Fitness Trainers on Instagram

Harley Pasternak works with a slew of A-list celebrites, including the stunning Megan Fox and Jordana Brewster, but his expertise goes far beyond the gym. He has a Master of Science in Exercise Physiology and Nutritional Sciences from the University of Toronto and an Honors Degree in Kinesiology from University of Western Ontario, and he worked as a scientist before turning to personal training. He’s also a motivational speaker, author, and television host, and shares his insights on food and fitness using his handle @harleypasternak. (Check out his fitness tip in Celebrities and Their Trainers Reveal: Healthy Habits That Last a Lifetime.)

Former New York City Ballet dancer Mary Helen Bowers trained Natalie Portman for her Academy Award-winning role in Black Swan, then went on to bring ballet-inspired fitness into the mainstream with her Ballet Beautiful program. She now works with celebrities like Zooey Deschanel, Lily Aldridge, Miranda Kerr, and Doutzen Kroes to help them achieve that lean ballet dancer look. Scroll through her feed @balletbeautiful and you may get the urge to practice your own plié!

Gunnar Peterson is responsible for keeping the beautiful booties of the Kardashian sisters in check, as well as the sexy curves of Jennifer Lopez and Ciara. With over 20 years of fitness experience, Gunnar has no shortage of innovative fitness ideas—and you can get them directly through his fitness-filled feed at @gunnarfitness.

Petite dancing queen Anna Kaiser works with celebrities like Sofia Vergara, Shakira, Kelly Ripa, and Sarah Jessica Parker, using her signature method of dance and sculpting. Her studio, AKT In Motion, features her signature dance routines that combine cardio movements with strengthening techniques from yoga and Pilates. Get hot body inspiration from her at @annamkaiser.

Known as “the butt guy,” David Kirsch trains hot celebrities like Kate Upton and Liv Tyler using multi-tasking workouts and focusing on nutrition for a holistic approach. Healthy meal ideas, workout videos, and fitspo quotes litter Kirsch’s awesome Instagram feed, @davidkirsch. (See how Kirsch helped Kate Upton become the “Sexiest Woman Alive.”)

Astrid McGuire started as a model, so she knows that taking care of your body is as much about looking good as it is about feeling good. After coaching fellow models, she broke into the fitness world and developed a cult-like following at Barry’s Bootcamp, where she still teaches. Now, she personally helps stars like Julianne Hough, Stacey Keibler, and Jessica Alba stay fit. Follow her at @asmfit for motivational quotes, workout videos, healthy food ideas, and pics of her adorable pup!

Mark Langowski of Body by Mark helps Good Morning America weather anchor Ginger Zee stay camera-ready with high intensity workouts that get her in and out of the gym fast! He shares fitness videos on his account @bodybymarkwellness that will give you great ideas of moves to incorporate into your own workouts.

Co-founder of ModelFIT, Justin Gelband works with some of the hottest celebrities and models, including Karlie Kloss, Chrissy Teigen, Candice Swanepoel, and many of the women that walk runway at the Victoria’s Secret Fashion Show. (Some are also mentioned in the 7 Fit Fashion Models to Follow for Fitspiration.) Scope his feed at @modelfit for a peek into his NYC-based classes, which use everything from trampolines, light weights, resistance bands, BOSU balls, and ankle weights to sculpt lean muscle.

Nashville-based trainer Erin Oprea has worked with some of country music’s leading stars, including Carrie Underwood and Jennifer Nettles. She's the absolute master of using your environment to train—whether it’s a local playground, your living room, or a set of stairs. Mix up moves from her Instagram videos (under the handle @erinoprea) for a seriously tough workout!

Two-time world boxing champion Danny Musico and his celeb clients like Hilary Swank, Jessica Simpson, and Justin Bieber will inspire you to get in the ring when you see his fierce Instagram pics (follow him at @dannymusico). Punch, kick, and werk your way to a hotter body while taking cues from this boxing master.

Client successes, workout moves, and cute manis rule Ashley Borden’s Instagram account at @ashleybordenfitness. She helps some of the sexiest people get even sexier, with clients that include Ryan Gosling, Christina Aguilera, Reese Witherspoon, and Kesha.

Holly Perkins is living proof that women who lift look seriously amazing. She works with celebrities like Adrian Grenier and Howard Stern, so she knows how to keep up with the boys. Follow her on Instagram at @hollyperkins for strength training moves that build lean muscle—and a look into her vast collection of bright sneakers! (These celebrity trainers aren't the only ones showing some fitspiration. Follow these fit stars featured in The Best Celebrity Fitness Instagrams of 2014.)