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  1. Abs curl - Muscle & Fitness

  2. Science Says: Best (and Worst) Ab Exercises - The Barbell

  3. Demonstration of Abdominal Curl Using Exercise Ball - YouTube

  4. 13 Best Exercise Ball Exercises for Strong Abs - GymBeam Blog

  5. Forget Russian Twists — this 10-minute stability ball workout …

  6. Abdominal curl on a stability ball (exercise video) - Physitrack

  7. A 20-Minute Pilates Ball Ab Workout | livestrong

  8. The Best Swiss Ball Abs Workout - Men's Fitness - Men's Journal

  9. 20 Swiss Ball Exercises That Will Sculpt Your Abs - Men's Fitness

  10. 50 Core Exercises That Use a Ball - Muscle & Fitness

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