As someone who tends to overdo it, looking for a quick fix to a problem, I would just advise you to take some caution when starting something new, like yoga. Yoga is strangely deceptive. Most people think it's "just stretching," but I know a lot of people who are injured in a yoga class because they decide to push a little further. And if you're competitive, it's very hard to sit back while others go into the advanced form of a pose or hold something longer than you're comfortable with.

Are there any classes for beginners? Or any beginner dvds you could try?