My best spinning teacher ALWAYS matched the music cadence to the cycling cadence. I really hate when spinning instructors don't do that and just have the music on as background.

iTunes is invaluable in putting together sets. I'm not an instructor, but I make my own sets for my trainer now that I no longer belong to the Y. I like to make sets that have a theme--something I learned from a very good instructor. So if your theme is spring, say, you search itunes for any song about spring or flowers or sunshine. That's just an example, of course.

I would just be aware of repeating your sets too often. If it's boring for you, it's most likely boring for the students, too.

Another thought--if you "dumb down" the workout to the lowest level participant, only that student will get anything from it, and you will lose participants. Make a good, solid, challenging workout and be sure to tell those who are new to go at a slower pace (and make sure they don't overdo it). That way, everyone benefits.

I miss my spin classes, but my favorite instructor has moved on and the others just weren't worth my time and money. Good instructors are hard to come by!