Healthy Living with Gwyneth Paltrow

Gwyneth says she wants people to know she had to work her butt off—literally—to achieve her weight loss goals. She also credits the person she calls her pint-size miracle, trainer Tracy Anderson. "She's the exercise genius of all time," Gwyneth says. "She developed this system of kind of doing dance aerobics so that you're not doing anything repetitive."

After meeting Tracy in Los Angeles, Gwyneth recommended her methods to her good friend, Madonna. Using cardio dance routines and resistance training, Tracy has helped both women transform their bodies. "She makes everything small," Gwyneth says. "She wants women to be long and lean and defined."

Most days, Gwyneth works out with Tracy at her home gym, but when she's traveling, she says she won't leave home without Tracy's exercise DVDs. "I do those DVDs whenever I travel," she says. "She completely changed my body."