Nicole Sherzinger

"As a dancer, I have to keep my core strong," says the Dancing With the Stars champion. To do it, she works out at least five days a week-often with Adam Ernster, her Los Angeles-based trainer. During their 60- to 90-minute sessions, the duo does circuits of three or four strength moves with limited rest in between, plus plenty of cardio. On her own, Nicole runs and follows a no-gear abs routine.

The Nicole Scherzinger Workout:

Do 2 or 3 sets of each abs exercise three times a week.

You'll need: A 6- to 12-pound Body Bar and a resistance band or tube. Find gear at

Bar Crunch

Bar Crunch

Works: Abs

A. Lie with knees bent and shins parallel to ground, and hold a Body Bar over chest. Crunch up, reaching bar over knees; lower and repeat. Do 8 to 12 reps.

B. Extend legs a few inches above ground and hold bar behind head. Bring left knee toward chest, then switch legs to complete 1 rep. Do 8 to 12 reps.

Standing Rotation

Standing Rotation

Works: Core

A. Anchor a resistance tube at head height and stand with your right side closest to it, feet wide. Hold a handle in each hand at shoulder height to right side, palms facing ground (tube should be taut).

B. Pivot to the left on right foot as you rotate torso to the left, pulling arms across body. Return to starting position; repeat. Do 10 to 12 reps; switch sides to complete set.