Yoga

My doctor, who is a smart lady, suggested I look into taking a yoga or pilates class, or get myself a good yoga dvd to work out with. She says I should look for the words "gentle" or "relaxation" in the course info.

Any suggestions for good yoga classes/studios in the suburbs? Woburn or Burlington would be ideal for me, but I’d go to Arlington, Stoneham, or Winchester for the right class. I’m looking for Complete Beginners Handholding. (Alternatively, how expensive IS a private session or two to get started?)