Maybe it's a style thing (I practice Chow Gar kung fu) but movement of weight is at least as important as angles of feet. I keep a recorder (nowadays a phone) in my car and make detailed verbal notes on corrections and insights from class as I leave.
Verbal notes have the benefit that you can play them back as you make the movements, often at reduced speed which is useful practice in itself. I imagine I'm coaching someone.
As you progress through an art, it's not the gross combinations of moves that matter so much as these fine details. If you want to get really detailed, you could even go down to where to distribute tension and effort throughout a movement.
I've been intrigued by the idea of notation for a long time but not got around to doing much study. I've been partly waiting for computer animations to get to the point where detailed hand shapes and movements could be tracked. One big benefit of having an animated rendering is that you could not only represent external changes in position but use colour to show weight shifts or muscle tension.
A paper I found, following up on the recommendation above, that has promise describes the use of notations to drive computer animation - Choreography-driven Characters [pdf].
I also recently saw the Martial Codex site, which has some great animation stuff. It would be awesome to have generation of movement of such characters from a notation, which would be an ultimate test of how comprehensively a notation covered movement.
It recently occurred to me that games character Rigging and motion-capture data formats might help in this area. There's an interesting overview from 2013 in this article which covers using Blender to reformat and cleanup files.
I've been thinking about this a lot more and considering writing an app to help document things.
This occasional background idea has acquired a lot more urgency because we sadly lost our beloved Sifu suddenly earlier this year and want to ensure recording more of our school's knowledge before his older relatives are unable to clarify or add details for us.
I've bought some books on Laban notation but it may not be a great fit so have been doing my own design. Whilst it includes some description of weight carrying it seems to lack weight distribution notation.
(Somewhat abusing this answer to record some thoughts in public) I think we need a way to document things more as variations on basic stances and transitions between them. It may be that Laban notation could be used for detailed bits but a recording of a form would use a simpler summary. There is a lot more repetition of standard positions and moves in most martial arts forms compared to free-form dance.
I'm doing some paper prototyping of having multiple columns indicating:
- Stance (allowing use of a simple symbol or letter code)
- Stance facing direction
- Eye facing direction
- Feet positions and turns (starting position of feet implied by the stance)
- Complex arm movements
- Complex foot movements eg when kicking
- Movement of weight - I think a simple bar with gradient or Sparkline would summarise this.