Whenever i'm depressed about drawing, or can't seem to loosen up enough to animate, i fall back to my "fun with spheres" game. basically, you draw a sphere, and you place characters onto it, holding it, being crushed by it.. whatever. and what happens is that you gradually loosen up within the context of space, weight, perspective and balance. in addition, i always draw in ink, so you're further forced to give your characters energy and movement. let me know if this little exercise helps anyone else, i swear by it! above is a page from my sketchbook from this past week.