The ABS Company Ab Coaster CTLThe 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 trackless CTL design features a frictionless resistance system making the motion very easy for any user, including deconditioned and