For most people, the arc of their golf swing or tennis stroke is an abstract image, something that happens much too fast for the unaided eye to see. Fortunately, modern athletes have a special tool available --- StroMotionTM --- with which to obtain and study an actual, visible record of their movements. But StroMotionTM is not a brand new concept --- in fact it's an old idea newly linked to digital video and computer software. StroMotionTM uses processes and technology developed by photographic pioneers such as Eadweard Muybridge, who conducted the first photographic sequential motion studies, and Harold Edgerton, inventor of the strobe light, which seems to stop even the speediest objects --- like bullets --- in transit.