The following exercise focuses on working your abdominal muscles. Start by doing 1 to 2 sets of 15. You should feel a slight burn in your abdominals at the end of each set. If not, increase the number of repetitions until you do.

Crunches on the Ball

Start by sitting on the ball, just forward of centre. Put your feet against a wall to prevent them from slipping. Cross your arms on your chest. Round your back by tensing your abdominal muscles.

Take in a deep breath. Straighten out your back and move your torso backwards. Allow the ball to roll towards the middle of your back. When your back is slightly arched, slowly start moving to your original position, rolling the ball towards your buttocks. Exhale at the end of the movement.

Don't ...
- Sit too far forward on the ball
- Tense your neck muscles
- Do the crunches too quickly, each repetition should take about 4 seconds to complete