An exercise device that has a shaft containing one or two rollers that are free to slide on the shaft. The shaft can be shaped near a semi-circle or can be normally straight and bent elastically to a near semi-circle. When the normally straight shaft is bent, it can be held by an elastic cord like a bungee cord. The invention can also be a small unit with one or more (preferably two) rollers that are held together by a pair of handles. For all embodiments, optional springs can connect the handles to the shaft.