Any body can do yoga. With teachers like JoAnn Lyons of the Piedmont Yoga Community making it possible, that is.
In this conversation JoAnn mentions different styles of yoga — Iyengar, Integral, Vedanta, and Sivananda. Check out these links if you want to learn more but this podcast is geared toward anyone with either an advanced or limited understanding of yoga.
Here are two books with great illustrations of people doing yoga using chairs: All I need is this Chair Yoga and A Chair for Yoga: A complete guide to Iyengar yoga practice with a chair.
Additional resources include the International Association for Yoga Therapists (this is where I search for yoga instructors in locations outside of the SF Bay Area) and the Accessible Yoga Conference.
Matthew Sanford is an inspirational yoga instructor who shares his personal story of surviving a car accident as a teenager in his book, Waking: A Memoir of Trauma and Transcendence.