The Kelly Osbourne Weight Loss Workout

Over the past year, this hour-long firming-and-burning routine from trainer Sarah Hagaman has turned Kelly Osbourne into a slim, sculpted, and self-assured star. "To prevent boredom and target many muscles at once, Kelly does a variety of strength moves on a Power Plate and Bosu," says Sarah, who's with Blue Clay Fitness in Los Angeles. "Mixing in cardio between sets keeps the calorie burn high." Follow her plan and start loving what you see in the mirror.

You'll Need
A Bosu balance trainer and a 9- to 15-pound Body Bar or a pair of 5- to 8-pound dumbbells. (Find gear at spri.com.) Don't have a Bosu? We'll tell you how to modify each exercise without one.

How It Works
Two or 3 times a week, warm up with 5 to 10 minutes of cardio (Kelly Osbourne walks briskly on a treadmill set at a high incline), then do 1 set of each move in order without resting between sets. Repeat once. To increase the calorie burn, perform mountain climbers (click here to find out how to do them) for 30 to 60 seconds between each move.

Get the Kelly Osbourne weight loss workout >>