The ProForm® AB CoreMaster™ gives you a three-in-one shaping and toning workout that will help you sculpt your core muscles - without moving to another machine or even changing positions. It gets you off the floor and upright for maximum results while giving you sexy, flat abs, strong, defined obliques and a more flexible lower back. And the ProForm AB CoreMaster's Spine Design™ moves like your body, following the motion of your spine, bending naturally for a comfortable and more focused movement.