Flybye glad you enjoyed your first spinning class. I would listen to your body. If you are tired, rest. You'll perform better in your next spinning class if you allow your body to rest and let your muscles grow. 
Once you get accustomed to spinning, although I am not a Master Instructor (I am STAR 3 JGSI), I would say if you are in training for an event (and you said that you are) you may benefit from spinning 4X/week in different energy zones. But not until your body is ready for that. Do you have your aerobic base built back yet from the winter, or are you still in your aerobic base-building period?
Last edited by Zeek; 04-03-2008 at 06:33 AM.
The Journey is the Reward.