Adobe Flash Player not installed or older than 9.0.115!
The video demonstrates an exercise for the abs with a ball, to begin with you need to sit on the exercise ball and walk forward making your back lean against the ball. Once you are in the position for crunches you need to place your hand towards your head.
Start with the crunches in a way that your chin comes near to your chest and ensure that on your way back you get adequate stretching for your neck muscles as well. Also remember to pause every time you come up for a crunch as well as when you go back after completing a crunch. This can help you build on flexibility, abs as well as lose the excess of belly fats.
In order to complete the exercise you need to come up from the laid position and walk backwards so that you can once again sit upright on the exercise ball. This exercise can be performed with a few repetitions for effective results.