One other important ab exercise, after you've cut the fat off your body, is lower body twists. It's has been mentioned, about upper body twists, with a broom stick across your shoulders. The best body twist, is a lower body, side to side twist. Stand on a swivel plate, and hold you upper body stationary. I use my power tower captain chair. I stand on the swivel plate, and keep my upper body stationary holding the hand grips there, while I twist my lower body, to the the left and right, using the swivel plate. One of the most excellent, and most productive abs exercises.