The unique design of the Ab Coaster® CTL features the patented Ab Coaster® bottom-up movement without rails. The trackless CTL design features a frictionless resistance system making the motion very easy for any user, including deconditioned and rehab patients, and makes for easy maintenance and super-quiet operation. The Free Swivel seat allows for seamless transition to oblique training. Add up to 60 additional pounds of resistance for progressive training.