I love love love yoga. It has so many more benefits besides just the physical but I love the way it can reshape your body. No high impact or jarring moves.
Hatha yoga is excellent for beginners, it focuses on stretching, breathing, and relaxation techniques. It is a good way to learn some basic poses and get comfortable with the basics of yoga. It is slow paced and definitely not what is considered advanced-which most people never really try to get to anyway. Hatha yoga is designed to help you cope with stress, anxiety, depression, relieving tension, etc.
If you try it and enjoy it, there are endless possibilities-it's something you can do at home without buying any equipment. I prefer that actually. I never liked doing it at a gym, with the walls mirrored and my butt in the air in front of a bunch of strangers. I like that I don't have to go anywhere so I can get in 20 minutes whenever I have time to spare, and if I get bored with a routine I can just get another dvd and have something new and a little different. I just got Denise Austin's Hot Body Yoga last week