YMCA Cycling

I've been to the Cycling studio a few times already.  They have a few different teachers and all of them have different teaching styles.  Some are more challenging than others.  I find that for the most part I have to be one or two gears below what they call out.  There's one teacher that I find impossible to reach the RPMs she calls out.  She calling out 90s and 100s.  I figure it's just best to do what I can.  Challenge myself but also pace myself.  She even said to listen to your body and do what's reasonable for you.  I'm just starting to aim for going consistently so we'll see how I do.