The video shows how you can perform advance level exercises for your abs with the stability ball. To start off you have to lean the side you are not working on to the ball and come in a sideward posture with your elbow underneath the shoulder on the exercise ball.

Once in this position you can start your sideward crunches, the side you are working on should be maintained very straight and the curl should not be more than 10-15 degrees. The curls should begin from the oblique so that you can get the best results for your abs. You have to contract on the inner side to create the strength and pressure.

To make the exercise a little more efficient you can extend out your lower leg so that you can also work on your balance while you are working on your abs. This way you can get the results in the fastest possible time.