The use of video references is an invaluable thing to better understand the nature of movements, allowing us to create more interesting animations. It is pretty common to record ourselves to use references of facial expressions and gestures.
But what about action scenes? Normal people go for other people's references. Not this guy:
Saw it at Miro Souto's blog.
I wish I could do that too (the exhibitions), oh wow. It's a good compromise to animation, really. ^_^
-Reyn