The Sprinter Stick is a segmental stretching device that's primarily used on the legs, including on the hamstrings, quads and calves. The Sprinter Stick is basically a bar made up of a semi-rigid core surrounded by independent, 1" long spindles that spin freely. It offers a great release of muscle tension and tightness when applied properly. A light to deep massage is controlled by the pressure that you are applying. The Sprinter Stick is also a favorite leg massager of many athletes as it's easily portable and fits perfectly in most travel bags.