This particular aspect of writing is something I've only just started paying close attention to, so I haven't experimented much.

Okay; that's fair. May I ask what your physical sense of your characters and scenes is usually like?

I expect I would do better, though, with describing something I've seen, because then I don't have to decide what the body language is before I figure out how to describe it.

I would try that as an exercise, then. If nothing else, I think it would help isolate what kind of information you find essential to movement and personality vs. what can be conveyed by other narrative means. Also, I would enjoy reading it.

This reminds me of the line in Dunnett about Lymond's skin being "neatly tailored over his bones," which is another one I always liked.

That is good.