Instructions
Straddle a bench and hold a Swiss ball comfortably on your lap.
Using your legs to hold the bench, lean your body back until your abdominal muscles are working to keep you upright (aim for a 45 degree angle) .
Extend your arms to hold the Swiss ball directly out in front of your chest.
Rotate your body to the left holding the Swiss ball at the extended position.
Rotate your body back to the center and then to the right to complete 1 full repetition.