Ab Lounge is a new ab machine that tightens and tones upper abs, lower abs and obliques faster than you ever thought. The Ab Lounge's secret is the advanced Jack Knife design which is clearly more effective than standard crunches. The Ab Lounge Jack Knife works your abdominal muscles with a fuller range of motion than crunches or sit-ups. And the fuller the range of motion, the longer your abs are toning and tightening during each jack knife rep. Ab Lounge also strengthens your core muscles such as your abs and back muscles where your functional strength originates.