Mike Alexander

Alexander is a personal trainer at The Sports Club/LA in Beverly Hills, Calif. His clientele includes Jessica Simpson, whom he trained for her role as Daisy Duke in "The Dukes of Hazzard," and Kristen Chenoweth. Web site: www.madfit.com

Jay Blahnik

Blahnik has been honored by the IDEA Health and Fitness Association as one of the top fitness instructors in the country. He is the author of the book “Full Body Flexibility” and has starred in more than 20 exercise videos, such as “The Calorie Combustion Workout” and “Serious Results with Jay Blahnik.” Jane Fonda is among the celebrity clients he has trained. Web site: www.jayblahnik.com

Jeanette Jenkins

Jenkins is an expert on the Food Network’s weight-loss show “Weighing In!” and a spokesperson for the Black Entertainment Television Foundation’s A Healthy BET Campaign, which was created to address obesity in the African-American community. Her workout videos include "The Hollywood Trainer Butt and Thigh Blast." Jenkins has trained Queen Latifah, Taryn Manning and Terrell Owens, among others. Web site: www.thehollywoodtrainer.com

Gregory Joujon-Roche

Joujon-Roche, author of "One Body, One Life: 6 Weeks to the New You," is a big believer that no single exercise plan fits all. He and his team at Holistic Fitness have customized workouts for Brad Pitt for his appearance in the film "Troy," Tobey Maguire for "Spider-Man," Leonardo DiCaprio for "The Departed," and Demi Moore for "Striptease." Web site: www.holisticfitness.com

Kathy Kaehler

A “Today” Show fitness expert, Kaehler is the author of the books “Kathy Kaehler Celebrity Fitness” and “Real World Fitness with Kathy Kaehler.” Her workout videos include “Kathy Kaehler Basics: Total Fitness Workout” and “Kathy Kaehler Basics: Workout Class.” Clients include celebrities such as Julia Roberts, Drew Barrymore, Cindy Crawford and Samuel L. Jackson. Web site: www.kathykaehlerfitness.com

Gina Lombardi

Honored by the National Strength and Conditioning Association as a top personal trainer, Lombardi has worked with clients including Catherine Bell, Beck and Andy Garcia. She is the host of the FIT TV show “FIT Nation.” Web site: www.ginalombardi.com

Rob Parr

"Neither my clients nor I like to spend all day in the gym," says Parr, who prefers to take his workouts outdoors, often running and mountain biking in the hills of Los Angeles. Parr helped Naomi Watts shape up for several recent films, including "King Kong." He's also worked with Madonna, Demi Moore and John McEnroe. Web site: www.robparr.com

Phong Tran

"Clients curse me during but love me after," says Tran, who works out of Joe's Gym in Los Angeles. In addition to shaping up clients such as Sarah Michelle Gellar, Tran also does sports-specific training and works with patients undergoing physical or occupational therapy.

Mari Winsor

Winsor, a Pilates guru, is the co-author of “The Pilates Powerhouse,” “The Pilates Pregnancy: Maintaining Strength, Flexibility and Your Figure” and “The Pilates Workout Journal: An Exercise Diary and Conditioning Guide.” She has worked with Courteney Cox, Daisy Fuentes and Courtney Thorne-Smith. Web site: www.winsorpilates.com

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