You can also use your Bender Ball to give your oblique muscles a run for their money along with the rectus abdominus muscle. Carefully lie back on the Bender Ball with your feet flat on the floor. Roll back slowly until your thighs and body are parallel with the floor. Then raise your body up while contracting your abs, up to a 45 degree angle, but not more. The closer that your feet are together the less stable you will rest on the Bender Ball and the better of a workout you will give those internal and external oblique muscles.
