I was thinking some gentle floor stretching and movements might be good.
Something with a yoga mat for cushioning.

there used to be a book called Callanetics it was isometric excerises - which is just tensing the muscle and releasing it.

Just did a search on it and it is still around- they have DVDs and groups might be one in your area.

simple and low stress low impact.
You should be able to find it in your library
here is a link for it too-
http://www.callanetics.com/booktape.php

here's a little video about it-
http://www.mindbodysoul.tv/episodes/...n/callanetics/

the google link with the search results listed-
http://www.google.com/search?hl=en&q...=Google+Search