Abstract: A golf swing training device for setting and maintaining proper arm position throughout a full golf swing teaches a proper golf swing by forcing a golfer to keep his or her arms in plane during the entire swing. The device includes a restraining wedge for maintaining a triangle between the forearms of the golfer when the wedge is held between the golfer's forearms. The restraining wedge is attached to the golfer's forearms by means of two forearm cuffs. Each forearm cuff can be placed on a forearm of the golfer without the assistance of another person. The forearm cuffs are then secured into the restraining wedge by, for example, a hook and loop fastener. The training device maintains the forearms in a skewed position which allows a full unrestricted golf swing.