I've been spinning 3-5 times/week on average the past month, but I did one at 5:30 last night and then another at 9:15 this morning. I think these 2 instructors have the following goal in mind: Kick Duane's ass so hard that he feels like he got run over by a truck when he wakes up in the morning.
Definitely felt it this morning and I know I'll be miserable Friday morning as well. Gotta love burning 1100 calories off in a single class though.