Do your chosen ab workout 3 times a week on nonconsecutive days, completing 2 or 3 sets of each exercise.
FOR FASTER RESULTS
Include 30 to 45 minutes of moderate-intensity cardio 3 to 5 times a week to burn off the fat that's hiding your abs.
Kristin McGee, a yoga, Pilates, and fitness instructor in New York City and creator of the DVD Pilates for Beginners, designed this workout.
To make the ball easier to control, release a bit of air from it; to increase the difficulty, pump it up. Bonus: You can sit on the ball during strength-training to add a balance challenge.
Targets rectus (front abs), transverse (deep abs), quads, inner thighs
Sit up straight on top of ball with knees bent, insides of legs touching, and arms extended to sides, palms down. Press knees and inner thighs together while lifting right foot and straightening leg. Lower foot and repeat with left leg for 1 rep. Do 8 to 10 reps.
MAKE IT EASIER
Place hands on ball by hips.