Ab Roller Wheel slims, trims and tones abdominals, Waist, Arms, Back, and shoulders.AB Roller Wheel is compact and portable: use it anywhere, anytime.AB Wheel is a simple device, easy to set up, and very efficient. It engages core abdominal muscles to give you the perfect tummy shape. It also exercises the arms, shoulders, and thigh. The Ab Wheel excels for building prominent Abs, core strengthening, and stability (Abdominal muscles). It has been around as far back as the 60s as a testament of its viability and utility.