Be aware (beware) that yoga is not purely a physical health regime. It's a spiritual form of worship to hindu gods/demons. The postures are prayer positions, etc.
The word "yoga" means "union", and it's referring to uniting yourself with these things (demonization is really what happens), inviting them in. A sure way to end up with more problems which you can learn about readily looking into it.
I say steer clear of all yoga and stick with good ol' fashioned stretching and relaxation.