Click here to download a PDF version of this application. This app can be used for tears or pulls in the hamstring group (Semitendinosus, Semimembranosus and Biceps femoris). It can also be used to enhance performance, prevent cramps or accelerate recovery. Simply move the app over the area where you feel the most pain. If you're still not getting relief we recommend you contact one of our Rock Docs for medical consultation.