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Crunches are the most common of all abdominal exercises but unfortunately are often performed incorrectly with poor results. Crunches on the Swiss ball offer several advantages over more conventional methods and machines. Using the ball facilitates full flexion and extension of your spine thereby training your abdominals through a full range of motion. Crunches on the ball also promote balance and stability stimulating your deeper core muscles in addition to the prominent rectus abdominus or ‘six-pack’ muscle. When done correctly the Swiss Ball crunch is super effective.