I think there have been a few threads re: doing yoga in the chair. In the most recent issue of New Mobility there is an article about Matthew Sanford, a Yoga teacher who has been practicing & teaching adaptive yoga for several years and also wrote the book, "Waking". a memoir about his SCI journey and how being a Yoga practitioner has effected his health and life.

He has a new instructional DVD out that is targeted to folks in chairs and all levels and kinds of disability. It is $24.95 which seems reasonable if it makes a difference. I haven't made the purchase yet myself but thought I would pass the info on to anyone interested.

Here is a review written by a new mobility contributing writer:

http://newmobility.com/articleView.cfm?id=12105