PowerLine Ab Crunch Bench / Machine Features full range abdominal resistance. Full range motion starts at 30 degrees back of center to 30 degrees forward of center for a full range of exercise motion. Curved back pad puts you in a pre-stretch position that allows more intense abdominal contraction. Extra-wide, sealed ball bearing pulley allows complete freedom of movement for oblique workouts as well. Indefinately adjustable back pad ensures quick and easy adjustment for all size users.