AbDoer Twist is made in a way to eliminates stress to hands, wrists, elbows, shoulders, neck and upper back. AB Doer Twist - A Treadmill for your Abs AbDoer Twist is made in a way to eliminates stress to hands, wrists, elbows, shoulders, neck and upper back. Enriched with Multiple Resistance Rods allows you to craft a challenging core workout. Next thing is swivel action seat, which increases fat ...