The CoreGlide® is a patented trackless paltform that uses elastic bands attached to the axles which gives the CoreGlide it's rebound properties. The resistance can be adjusted by adding or subtracting bands. The CoreGlide® offeres both a short and a long travel setting for specific exercises. No only is the CoreGlide® is a great device to use for rehabilitation but also develops the body's core. Used by many in multiple sports like Snow Skiing and Ice Hockey to name a few.