A golf swing training device that fits on the inner down swing arm and optionally it has a thumb restraint extension. The device comprises a shell contoured to fit the inner arm from the wrist to the lower portion of the upper arm which is strapped to the arm. The device cocks the arm slightly but fully...http://www.google.es/patents/US7097571?utm_source=gb-gplus-sharePatente US7097571 - Golf training device
