With Wonder Core, you're getting resistance on the way down and up with every rep. with dual resistance, you're getting double the workout in half the time! Wonder core provides a full 180 degree range of motion. That means you can isolate and train your lower, middle, and upper abs-more range of motion means a much tighter core. Wonder core is totally adjustable to your fitness level. You'll get the ideal amount of resistance in the way down and have the right amount of support customized to your exact fitness level coming up. That means everybody can do it! You can blast away your love handles with the total built in Wonder Core twisting featured for a total core workout. Best of all, with Wonder Core, you're nestled in an ultra-comfortable seated position with your head and neck fully supported through range of motion.