I just started spinning - have done a total of about 6 classes since November. I started because I have not been able to ride outdoors and found the traditional exercise bike not challenging/fun enough.
The 1st class was so hard I didn't go back for 3 weeks (when I could finally walk normally again
I still have trouble with the "jumps" and find I cannot do high RPMs while standing. I never find it boring - just challenging- my heart rate soars and I need to sit out some of the more intense bits. I like the loud, pounding music -even if it isn't the type I would choose to listen to myself. The class is always full - in fact you need to arrive 30 minutes early to even get in. (I'm guessing about 50-75% of those attending are actual bikers and 95% are younger than I am.)