The PurAthletics Ab-Wheel Glider when used just minutes a day will target, Abs, Oblique's, Triceps, Lats, Back, Shoulders & Arms. Helps strengthen your overall core, building muscle firmness and flattening the tummy. Unique coiled directional springs prevents ab glider from over extending for safety. 4 -wheels add stability and safety in extensions. With Instructional & exercise Sheet