Start Position: Stand and grasp a bar or broomstick and rest it on your shoulders. Keep abs tight.
MidPoint: Twist your upper torso from side to side, until you feel a good stretch in your obliques. The movement should come from your abs, not your shoulders or your hips.
Finish Position: Continue twisting from side to side in a controlled, continuous motion until abs are exhausted, usually about 20-30 reps.