I have had participants in my class with asthma, and i recommend bringing in their inhaler to class.

Classes can get warm, fans help, but the nature of spinning is , you are sweating and the air circulation is not great, even with air conditioning and fans. so the air can get "thick" for those who are sensitive to it. you might want to pick a bike that is close to a fan to help with your breathing...

spinning is similar to riding outdoors, but not 100%. the main thing is that you are CONTINUOUSLY pedalling for the whole class. no coasting. which can be hard on those new to the class, so take things at your own pace, and slow to start.

have fun!

hannah