Want flat, defined abs? Dust off your fitness ball and try this simple exercise today!

Fitness ball rollout - Exercise for abs & core - PICTURE - Women's Health & Fitness

How to:
Kneel in front of a stability ball with your knees hip-width apart, then place your forearms on the ball, hands in loose fists.

Keeping your back flat, brace your core and slowly roll the ball away from you by straightening your arms; extend as far as you can without allowing your hips to drop. Pause, then bend your elbows to roll the ball back to start.

Repeat eight to 10 times.

NEXT: Ball V-Up

Workout: Nichelle Laus; Model: Monica Winn; Photography: Dave Laus