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An instruction device is illustrated which comprises a mirror and a transparent carrier sheet with a plurality of superposed images on the sheet, each of which images shows a different stage in a movement to be followed by a trainee. A stand is provided for supporting the sheet in front of the mirror so that the trainee can observe the images on the sheet and his own reflection simultaneously to allow him to follow the movement and to observe any deviations from it. Particularly, the apparatus is designed for instruction in a sports activity, such as in golf, although it might be used for other purposes, and in such an instance, it is desirable that mirror should be convex and disposed at ground level and at an angle so that a trainee can follow his movements without lifting his head.