Thanks for the websites & advice. I definitely transition music from one to another & mix in different genres. My morning classes are an older crowd, so they like the earlier rock tunes, show tunes, etc. I still mix in some contemporary songs, but nothing that approaches hip/hop or rap.

The evening classes are a gas. I have some younger kids that come in with their "dude walks" going, almost daring me to make them sweat. They get hip/hop, long climbs & fast sprints. Last week I had them whining for their mommies. It was great. They loved it.

I was trained in the Johnny G style, so it's pretty straight forward. No push ups or stretches on the bike. Decent warm ups & cool downs. At Ballys, on the other hand, they had a substitute who had us in a hard sprint right after the warm up. They really need me.