... body workout! First, it tones your midsection as you perform effective crunches at ANY fitness level ... Head, and Upper Body.3. Perform Effective Abdominal Crunches at ANY Fitness Level.4. Ab Burning ... as treadmill, upright bike, fitness bike, recumbent bike, elliptical trainer, stepper, exercise bench, home gym, trampoline, rowing machine, AB machines and so on ... , Calories AB ROLLER ABR-2 AS SEEN ON TV