1. A method for tracking an object approaching an athlete, the method comprising: at least three different cameras having different positions capturing three or more different sets of video images of the object approaching the athlete, wherein the athlete is in a stance prepared to strike the object; a server processor receiving the three or more different sets of video images, wherein the three or more different sets of video images comprise the stance of the athlete; the server processor approximating at least part of a 3D trajectory of the object based on the three or more sets of video images; and the server processor superimposing a graphical representation of the at least part of the 3D trajectory of the object over at least one of the three or more different sets of video images.