Here are five challenging fitness ball exercises which primarily focuses on improving strength in your mid-section. Be sure to assess your structural integrity and fitness level before attempting these exercises. Consult your personal fitness trainer to find out which exercises are best for you. When you're ready, try these out and have a Fab-BALL-lous and FUN-tastic time!

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Exercise : Twisting Ball Crunch Muscles : Obliques, Rectus Abdominus, Transverse Abdominus Level : Beginner Demonstrated By: Mary Ahn

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Exercise : Hamstring Ball Rolls Muscles : Hamstrings,Glutes, Thoracolumbar Fascia (lowerback) Level : Intermediate Demonstrated By: Lori Morimoto

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Exercise : Ball Toe Roll Ups Muscles : Rectus Abdominus,Hip Flexors, Transverse Abdominus,Quads, Lower back, Pec Major, Deltoids Level : Advance Demonstrated By: Jennifer Higgins

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Exercise : Unstable Reverse Ab Crunch Muscles : Lower Rectus Abdominus, Transverse Abdominus Level : Advance Demonstrated By: Mary Ahn

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Exercise : Ball Bridge Extensions Muscles : Erector Spinae, Hamstrings, Glutes Level : Advance Demonstrated By: Jennifer Higgins