A golf putting-training device attachable to a golf club having a deformable rod member that is be shaped into a triangular configuration with a rod insert end then placed into a rod receptacle affiliated with a golf club fastener element forming a spaced apart triangular guide from said golf club wherethen the user forms a similar triangle extending from their hands, through the arms and between the shoulders and uses the guide to identify unwanted joint flexure or rotation during a putt thereby enabling corrective action.