Here, the human figure is throwing a football and, to learn proper technique while watching the video/succession of images, {HEAD ~ a viewer} can change {TAIL ~ the orientation} of the device to see different angles of the human figure to learn how to emulate the move 
change
Here , the human figure is throwing a football and , to learn proper technique while watching the video / succession of images , { HEAD ~ a viewer } can change { TAIL ~ the orientation } of the device to see different angles of the human figure to learn how to emulate the move
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH