I've been doing spin classes for 15 years, to augment road biking. Most of the people in the classes, including many of the instructors, don't do any outside biking at all. Things like standing and pedaling at high rpm, or the "stand for 10 revolutions/sit for 10/stand again/etc." type moves aren't anything I do when biking on the road, so in spin classes I just ignore those. Standing I'll do 70 rpm max.

The good spin instructors always say "Ride your own ride, you don't have to follow my lead if you don't want to do any particular moves." There is one local gym that has what they call "RPM" spin classes and I didn't like them - the instructors were more rigid about the high RPM stuff. I asked my favorite spin instructor about them (she and her husband do a lot of road biking) and she was not a fan,either.