Slimmer Waist & Toned Abs The waist twister machine exercise twist the resistance pedal back and forth by exerting force on the waist and thighs to help exercise the waist, abdomen, thighs and muscles to achieve the effect of thinning the waist, strengthening the abdomen, losing weight and shaping the body. Extreme StabilityThe Ab machine is a double-pedal design. Compared to traditional single-disc design, it allows you to stand with your feet apart while using the device. Our twisting machine can stand safer and more stable.