Gestures! the more I do gestures and look at gesture drawings I like, the more I understand that there is not 1 way to do gestures. I think gestures are great for any type of artist, regardless if you are a fine art painter, animator, comic artist,...
These are more character based, and I rely a lot more on knowledge than observation:
45 second posemaniacs, drawing a simple character instead of the dry anatomy model on posemaniacs.
Finally ( http://artists.pixelovely.com/practice-tools/figure-drawing/ ). 60 seconds: