... Neck, Head, and Upper Body. 3. Elbow support. AB ROLLER ABR-2: SET-UP SIZE72*69*61CMCARTON SIZE70*36*11.5CMN.W ... .3. Perform Effective Abdominal Crunches at ANY Fitness Level.4. Ab Burning & Oblique Busting. 5. Additional elbow supports 6. Targets ... bike, recumbent bike, elliptical trainer, stepper, exercise bench, home gym, trampoline, rowing machine, AB machines and so on. All products are produced ...