Performed
correctly:
1. Start
in a push up position and your shins on top of the stability ball.
2. Slowly
bring your knees in towards your chest and elevate your rear, while
contracting
your abs.
3. Return
slowly to the starting position. When your legs are extended make
sure you
keep your hips in line with your body, not letting them drop towards
the
ground.
4. Repeat
for 12 – 16 repetitions.