If anyone's interested, a flash animator is giving lessons away (yes, you need to play but it's cheap) and teaches a variety of things. His july and august pack contains a very detailed tutorial on how to draw the human body in different forms and then animate it! And yes, when I say different forms, I mean plump aswell!
I've never actually tried the tutorial but if anyone wants to have a look, here's the link:
http://www.cartoonsmart.com/july_august.html
Hope I helped out a bit :)
TheOne