At the Y. Used elastic bands. I arrived late enough to miss out on the "new" olive green bands (med. strength). All that were left were pink (older ones, light intensity) and new gray ones (heavy duty). I took a pink one.
During one of the exercises with the band, my pink band popped/broke (this was after at least one other had broken for others in the class -- an epidemic!). I got a gray one and took it easy on the rest of the exercises.
Noted: new (non-slip) yoga mats! Hurray -- there should be enough for everyone now.