This is footage from a documentary about the creation of Studio Ghibli's film, Princess Mononoke. During the process, a few inbetweeners took a test to be promoted to key frame animators. The scene they had to do was very difficult and the results were interesting.
To add to that, here's a video of Miyazaki himself animating a scene where the main character takes a tumble. The comments he makes are so interesting and he tries so many different approaches for a scene that's only about 1.5 seconds long.