Waist Reducer Body Shaper Trimmer Pull Rubber String for Reducing Waistline and Burn Calories for Body Building Training. A simple but effective, Tummy Trimmer mainly targets your core helping you reduce belly fat and keep your abdomen taut and fit. The exerciser functions as a hand gripper. Grip the inner handle and pull. It exercises your arms, wrists, fingers, forearms simultaneously. You can do multiple exercises at home. Comfortable and Safe to Use, Tummy Trimmer can be used to do Ab Crunches, Leg Raises, Sit-Ups, Bicep Curls and more. In your session of exercise at home, you can target your belly, buttocks, waist, thighs, hands, arms, shoulders and back.