Begin by sitting on the ball with the dumbells resting on your thighs
Slowly walk your feet forwards until your shoulders and head are resting comfortably on the ball
Ensure that your bum is raised so there is a straight line through your body from knees to shoulders
Begin with the dumbells in the air above your chest
Slowly lower the dumbells to the side, ensuring you keep your arms straight (your arms should be very slightly bent, avoid locking at the elbows)
Using control, return the dumbells to the very top, be careful not to lock your elbows
Repeat steps 4 to 6 until you can no longer maintain correct technique
Tips
To get the most from this exercise, be sure not to change the angle of your elbows, your arms should stay almost straight throughout the repetition
This exercise should ALWAYS be performed under control, be sure to raise and lower them slowly, ideally 2 seconds up and another 2 seconds to come down
If you are new to the FItball, try getting into position a couple times without the dumbells until you feel comfortable