'Swiss Ball Exercises to Strengthen the Core  A primary benefit of swiss ball exercises as opposed to exercising directly on a hard flat surface is that the body responds to the instability of the ball to remain balanced, engaging many more muscles.   1. Crunches  2. Ball Rolls 3. Back Extension 4. Swan Dives 5. Jackknife   Katerina Popkova of Legallyfit.co.uk takes us through her top 5 Swiss ball exercises.  ListedFit.com' 

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