... PRODUCE FOR KF-ABW-02 AB wheel,AB SCOOTER,scooter,SPORTS wheel,sport wheel,exercise wheel,SpecificationsFeatures: 1 ... be isolated, causing an effective extension and contraction of the AB muscles in your arms, shoulders and ... toward your knees, emphasizing the re-curling of your torso, and exhaling Warnning Always begin ... your balance. It also comes with a free mat to be used under your knees for added ...