I did about four months of the mysore ashtanga program at Yoga is Youthfulness ("YiY") and it was great - the best practice ever. (I stopped because I changed jobs.) The teachers are talented and most importantly, they are friendly. They do everything with good humor. If you want to learn more about ashtanga or mysore, check out their website.
YiY has other yoga classes, too as well as occasional parties and monthly hikes. They're a really friendly group and the students come from diverse backgrounds.
If you are in the area, please check it out.
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