Spin class from hell

So rather than endure another thrilling session on my bike trainer, I decided to go to the spin class at the local Y tonight. I've been to it a few times and it's usually a decent workout but nothing too killer. Only tonight the regular instructor wasn't there and she was replaced by some kind of masochist. This lady decided to have the class ride at basically 90-100% resistance (including sprints at that resistance) for the entire hour. And it was really warm in the room, so not only were my legs trashed, but I was completely drenched on top of it...