I attended an evening flow class. I'll start with the good bits -- the instructor was great, the flow sequences were challenging, the music selection was super. Now for the bad parts -- there were about 50 people crammed into a studio that I'd guess holds 20 comfortably. My mat was one inch (literally) away from those in front of, behind and next to me. The class started about 15 minutes late because the instructor had to move mats here and there trying to squeeze everyone in (actually a very admirable job of accommodating folks). The room started out at a comfortably warm temperature and ended up a stinky, sweltering mess. Any balance I could have gained from the practice was otherwise washed away by the pool of communal sweat soaking the floor (and walls). Perhaps others don't mind this, but I found it hard to focus on anything other than avoiding the flying arms, legs and sweat of the other yogis in the room.