This is a method comic artists use a lot in comics to demonstrate agility and speed.  In this method a character is drawn several times in one panel in different poses.  They do this a lot in comics like the Flash, Quicksilver, or Spider-Man.  It is also used to show transformations, like Banner turning into the Hulk or Hulk turning back to Banner, or Ben Grimm becoming the Thing, or Giant Man or the Atom growing.  Animated Panels can also be used to show a character's combat skills, like in Iron Fist or Captain America.