Yeah, loads of reasons, mostly because I know I’ll get some useful training out of it and it seems like the lesser of two evils compared to trying to get in some dark wet and cold miles in on the road bike.
I’ve also spent the last three or four winters nursing wee injuries and it’s easier to nurse them in a spin class as you can mess with the handlebar position etc. etc.
Still trying to find my proper heart rate zones, think I spent too long too high at the last class, wiped me out that evening and most of the following day! 😕