The Ab Coaster® PS500 puts you on the fast track to great abs!💪🏼⁠ ⁠ This machine works exactly the opposite of a traditional ab crunch machine. Rather than working your ab muscles from the top down, the Ab Coaster PS500 works from the bottom up, helping you target those hard-to-reach lower abs.⁠ ⁠ Just kneel on the comfortable carriage, and pull your knees up. It’s as simple as that! As you lift, the knee carriage glides along the biometrically-designed curved track, engaging your lower abs fi