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What Personal Trainers Wish Every American Woman Knew

Name: Jillian Michaels

Jillian Michaels (from REDBOOK Feature) Photo Works with: Tara Reid, Amanda Peet, Vanessa Marcil, Nicole Kidman; fitness consultant to Redbook magazine's Real-Life Healthy Life campaign.
Latest venture: Winning by Losing: Drop the Weight, Change Your Life (book, $25)
What I want you to know: "Go beyond your "target fat-burning zone" when you do cardio. It's true that when you work out less intensely at a lower heart rate (65 percent to 70 percent of your maximum), you burn a higher percentage of fat calories over sugar calories. But when you get your heart rate up to at least 85 percent, you'll ultimately burn more total calories overall of both fat and sugar, making it a better weight-loss strategy.

Name: Harley Pasternak

Harle Pasternak (from REDBOOK Feature) Photo Works with: Alicia Keys, Eva Mendes, Kanye West, John Mayer, Zach Braff
Latest venture: 5-Factor Fitness: The Diet and Fitness Secret of Hollywood's A-List (book, $15)
What I want you to know: "Train your body evenly. Many women will pick a body part they don't like-like the inner thighs or butt-and work more on that than on the rest of the body. But this causes muscle imbalances and leads to injury, poor posture, and a worse physique. Just as you train equally on your left and right sides, train equally in the front and the back."

Name: Gunnar Peterson

Gunnar Peterson (from REDBOOK Feature) Photo Works with: Jennifer Lopez, Angelina Jolie, Brooke Burke, Penelope Cruz, Matthew McConaughey
Latest venture: Core Secrets fitness program (videos and exercise ball, $10-$80)
What I want you to know: "Strength training doesn't make you 'big.' Women have on average only one-tenth the testosterone that men have, which means that their bodies are far less able to build big muscles. In fact, all training breaks down muscles; the building occurs after exercise while you are recovering, and only if you take in the proper nutrition at the proper time."



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