Catrin, this sounds just as bad (good) as my class. Somewhat similar.
Today, a new woman came and almost fainted. This is not a class for a beginner, and little is done (at least by the Tuesday instructor) to help people modify. I don't like this aspect and the woman said she felt like puking at the end. I was quite concerned. I often felt like keeling over for the first 2 months, but I guess my suffering quotient is quite high from cycling. I kept thinking, "If you can climb those 18% grades, you can do this."
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport