Abstract: A golf swing training device includes a sleeve or strap arrangement to be worn about the elbow of a golfer's leading arm and an elbow bracing assembly attached to or integrated with the sleeve or strap arrangement. The elbow bracing assembly includes pivotally connected first and second brace members and a lock bar slidable within the first and second brace members between a locked position and an unlocked position. The lock bar in the locked position substantially prevents pivotal movement of the first and second brace members, thereby preventing bending of the elbow of the leading arm during a back-swing and down-swing portions of a golf swing. The lock bar in the unlocked position allows pivotal movement of the first and second brace members, thereby allowing the device to bend with bending of the elbow of the leading arm during an up-swing portion of the golf swing.