You can eat more potato chips if you do your crunches! Well, actually, this Ab Lounge Ultra's "Jackknife" exercise delivers a better abdominal workout than simple bent-knee crunches! Unlike crunches, it supports your body, especially your head, neck and back, throughout the exercise. It effectively works your muscles in the upper and lower abdominals, and obliques (the "love handles" area). And because you're up off the floor, your muscles have a total range of motion for better results. The new Ultra model has a top Focus Strap along with padded handles, for varied hand positions.