The Marie Claire Challenge: Power Up Your Life!

Are you ready to change your life for good? Welcome to the smart woman's guide to becoming slim, strong, motivated, and focused in 12 short weeks.

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While your friends have made and remade (or flat-out nixed) their New Year's resolutions, you're on your way to the body you want, thanks to Part I of our 12-week program last month.

Now, take it up a notch: Zero in on foods that give you energy, exercises that give you strength, and mental techniques that give you power. We called in Jillian Michaels the trainer who gets serious results on The Biggest Loser, to help you do it. (Find out more about her at jillianmichaels.com.)

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With this program, you could lose 5 to 8 pounds a month — that's 15 to 24 pounds by March. This isn't a lose-it-fast-then-gain-it-back scheme; this is the plan that works for life.

Every week, click on all the essential components of your success plan:

Your Workout Plan

Your Food Plan

Log It

and Motivate Me

And don't forget to enter the sweepstakes for a Schwinn 131 stationary bike worth $399, and our Giveaway-A-Day.

About your trainer: Jillian Michaels

Jillian Michaels not only gets in her clients' faces, but also stays in their minds, so every time they think about making a bad choice, they know how to talk themselves out of it. Michaels knows how you feel (and what your excuses are!). She was once an overweight kid and teenager (age 13 and 155 pounds), and dropped the weight by eliminating junk food, white bread, and taking up martial arts. She didn't lose the final 10 pounds until she started doing calorie math and making sure she consumed less than she burned — the cornerstone of the food plan she offers here.

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