Should I? Or Shouldn't I?

I have recently gotten into a fitness craze. It all started with my New Year's Resolution and this year I plan to stick to it! I started going to the West End Y again and tried a gravity class thanks to the urgings of a friend who goes with me. I have never liked exercising. In fact, on my list of things I hate, exercising was at the top. For some reason though, I LOVE my gravity class. On the days I don't go, I think about it. A lot. I am a bit obsessed. I have no idea why this particular class has peaked my interest. But it has. I've been going now every week for two months and I have yet to get bored (my usual complaint about exercising).

So the question I am trying to answer is, Should I try spinning as well? I'm a little scared of spinning. Bike riding as a general rule is not my fave because it hurts my butt. So the thought of doing an hour long class with a sore butt does not appeal to me. However, I have spoken with a few people who swear by their spinning class (and swear that the sore butt goes away). I am starting to muster up the courage to do my first class but would love to hear from you to see if doing this class would be a good thing or if it would halt my recent success with exercise and have me run screaming from the gym?