the present invention provides an exercise device for exercising the human body , wherein the device is formed as a low friction apparatus for use on a variety of surfaces . the device in a particular form incorporates a retraining harness that is affixed to the device that allows the user to secure their hands and feet into separate devices . the present invention is also directed to a device that allows the user to select between high friction and low frictions parts of the bottom , so as to perform an expanded array of exercises .