When I have been in spinning classes that are not working for what I need to do that day; I just alter them to fit me and my needs. I've never had an instructor get mad especially after I say I am training and what he has planned just won't work for me on that day.

So, then if you stay cause you need more time on the bike; alter the workout - like instead of high cadence standing stuff (which is pretty stupid if you ask me); do seated high cadence sitting stuff that will help you keep your spin while climbing!

spoke