Gunnar Peterson is a Beverly Hills-based personal trainer whose clients include celebrities, professional athletes, and everyday people. Gunnar works with each client on an individual basis, focusing on achieving long-term results through challenging and constantly varied workouts. He is widely recognized for his expertise in functional training and his commitment to developing and implementing innovative fitness techniques. With more than 17 years in the fitness industry, Gunnar's dynamic approach, boundless energy and humor only add to the effectiveness of the experience his clients enjoy.

With a client list as diverse as his training methods, Gunnar emphasizes strength training modalities that can be transferred from the gym to daily life, from training camp to championship. He has worked with athletes from the NBA, NHL, NFL, USTA, professional boxing and various NCAA sports. Many film and television celebrities have also sought Gunnar's guidance in preparing for roles and have stayed on to become devoted clients, making him a part of their regular fitness regimen.

Gunnar's innovative approach and his devotion to pursuing and communicating only the most credible and effective fitness information have resulted in several corporate partnerships and business opportunities. Gunnar currently enjoys relationships with Adidas, The Gatorade Company for Propel, and Clif Bar, Inc. He has partnered with Guthy-Renker to develop and produce “Core Secrets,” a fitness system featuring full-body and body-part specific workouts that focus on strengthening the core of the body. He released his first book, G-Force, in January 2005 (Regan Books). Now out in paperback as The Workout, the book is about training, making it a part of your life, creating and maintaining a positive mindset, and improvising to keep workouts effective and interesting. Through his own fitness product development company, Outside Shot, Gunnar has created The Bottom Line™, a total body exercise machine, The RAC™, an accessory that incorporates weighted upper body work with Spinning®, and Hoop Hands™, a basketball-specific resistance training aid.

Gunnar is certified by the National Strength and Conditioning Association and the American Council on Exercise, and he is a graduate of Duke University. He is an editor and writes a monthly column for Muscle and Fitness, is on the advisory board for Fitness magazine, has been a contributing editor for Glamour, and has a recurring feature in L.A Confidential magazine. Gunnar is also regularly featured in Allure, Elle, In Style, In Touch, US Weekly, Men's Health, Women’s Health, Self, Fitness and other magazines. His television appearances include The Today Show, CNN, CNN Headline News, The Big Idea with Donny Deutsch, Extra, and shows for E! and VH1.

Gunnar's clients include film and television celebrities as well as professional athletes from the NBA, NHL, USTA and boxing. He also works with everyday people who want to make a change. Many of Gunnar's clients train with him year-round as he works to keep them challenged while undulating their training to minimize potential plateaus, both mental and physical. He is more than their personal trainer - Gunnar is a lifestyle.