Hmm...I had a hard time on this subjest last year, but realised only "noticable" movements are needed in animations, there are animation sheets you can analyze and look at the seperate movements, but ones like the one Bliz posted are for people who have defined animation mentally. Good luck and remember, the best way to learn is to find out for yourself and make some of your own, trial and error is an extra to it!
~Winged