I don't know the O2 in Sommerville, but when I wen...

I don't know the O2 in Sommerville, but when I went in Portsmouth, NH they were amazing. GREAT assortment of classes, fabulous instructors that were patient with beginners, and every class was challenging. Since I left Portsmouth I have not been able to find its equal.
Best......Yoga......ever.
It's hard to find a yoga center that you can just drop in on as well. This place was the BEST!!!!
And most yoga I've done since then is not as challenging.
They are great and you will love it.