Abstract: A club-swing marker assembly includes a flat base member (18) permanently affixed to the front shoulder area (16) of a shirt (12) and covering a relatively large area thereof but having a fastening means (29) thereon for cooperating with a releasable fastener means (40) of a marker member (20) which can be easily and repetitively moved about on the base member (18). The fastening means is a hook/loop fastener pair. A marker element (36) on the marker member (20) contacts the chin area of a sportsman at a predetermined point during a swing of a club thereby providing a distinctive sensation which indicates to the sportsman that such contact has been made so that the sportsman will be aware that a correct club-swing position has been achieved. The marker element is constructed of a humped hook-fastening member to form an indicating ridge having fastening hooks thereon for contacting the sportsman's chin.