I've been practicing a little yoga for the past few days and I love it, it's more of a physical health yoga though. I'd love to start practicing regularly but I don't know anything about yoga and it seems complicated with how many different styles there are.

Does anyone have a recommendation of a yoga book/dvd for a beginner? (something that is a little more advanced than just the basics, I'm new to yoga but I'm in very good health and pretty flexible, I'm only 20) I'm not sure where to start but I would love to