Let the AbCoaster PS500 get you on the fast track to great abs! This machine works opposite from any traditional ab crunch machine you’ve tried in the past. Rather than working your ab muscles from top to bottom, the AbCoaster PS500 works them from the bottom up. This helps you target those hard to reach lower abs. Kneel on the comfortable carriage and pull your knees up. It’s that simple! As you lift, the knee carriage glides along the biometrically-designed curved track, engaging your lower abs first, then the middle and upper region, giving you a complete abdominal workout from the bottom-up. The PS500 is the base model for the Personal Series home market.