Aya-- Since you've learned this via the books--is it your estimation that a person interested in practising this method do some particular anatomy/physiology study beforehand? I am surprised it does not look as though that's 'covered', or required, at least as far as I can tell from reading either Yuen's or his students' sites. In any other 'healing' modality I've looked into, anatomy/physiology is a major component...Yuen himself has a solid grounding...
I'm guessing the teaching manuals provide diagrams, but still--if there's any particular book you would reccommend as 'background' material, I'd love to hear...