LOVE! beautiful, simple, and fun. yoga teachers are all great people. this isn't serious yoga -- it's more playful and meditative, but the teachers will make it as challenging as you want. if you want a sweat your balls off kind of class, you can get one, but you need to seek out those classes.
and did i mention the rates? if you buy a pass, then each class can average out to about $7-8. and they're not for profit -- and all of their extra money goes to an animal shelter.