The proform ab glider combines two motionsr r circular burnr arc crunchr r these target both your abs and obliques in a fast fun and easy cardio workoutr if you want a fast fun workout for your abs and entire core then ab glider pro is the product for your key benefits and featuresr r made from gym quality steelr vertical motion for your abdominals and lateral motion for your obliques r an on board personal tracker computer with an easy to read lcd that tracks progress by counting reps and tim