Abstract: A mirror has a diagram of preferred movements and a practicing person, such as a golfer practicing a proper golf swing which is diagrammed on the mirror, stands in front of the mirror and follows the diagram. The diagram has lines to be followed, for example, 2 straight vertical lines 1 and 2 for locating the person, intersecting straight angled lines 4 and 5 intersecting each other and the lines 1 and 2 and a diagonal line 3 intersecting the lines 1, 2, 4 and 5 for guiding the swing. The diagram may be a decal on the mirror, a removable clear plastic sheet attached to the mirror, or indicated directly on the mirror by paint, crayon, and the like. The person can be provided with written or private instructions, or a video tape.