It began with a guy who wanted to prove that, at some point in travel, a horse runs with all four feet off the ground at the same time; soon, English photographer Eadweard Muybridge pioneered work that would show motion and influence later work with film. By using multiple cameras to capture motion and creating the zoopraxiscope, he could provide a series of photographs that displayed movement in time.
This Muybridge series captures a horse as it jumps and clears a pole. For me, the interesting thing about the event sequence that he captures is that the action captured is too fast in real life for us to take in with our own eyes. In the late 1800's, before many of our modern innovations, Muybridge had devised a way to slow down a sequence to freeze moments in time. That's pretty impressive.