I have to say I don't know much about Yoga. I knew this girl in college who was going to try it, but read in some book you can die doing it, so she forgot about it. (I think that was extreme Yoga).
I know there are some sights on the web that feature pictures of women wearing Yoga pants and NYDN Back Page guy lost a bunch of weight doing Yoga a few years ago and you need a mat to do it. We bought that Wii Fit board a few years ago, and now that is where my kids stack up their video games.