Our local spinning class is held in a racketball court. Worst acoustics ever and some instructors play the music ridiculously loudly. I got a decible meter app and after showing some instructors what was happening they actually lowered their volume a bit but I don't attend one class simply due to the loud music. Our instructors work for free so it's appreciated and I can't complain. I bring ear plugs that are on a short cord so I can put them in as needed without losing them. Getting a hard workout outdoors is an issue below zero simly due to the danger of getting all sweated up and then having a flat or other mech problem so spinning allows me to work in a seriously hard way that I won't do outdoors in winter. I don't think any of our instructors are cyclists and not many of the users are cyclists either. They donate their time and it's appreciated even when I put the ear plugs in and go off into my own personal workout.