Night and Day. Morning classes = people who want to work out & get out. Nobody is picking up anybody. Talking is allowed, but just casual stuff - no heavy time-wasting conversation.

Evenings = rabid. One guy grabs paper towels and "saves" the good spin bikes for his friends, even though it is against the rules. You have to get there 30 minutes early to get a good bike. People are rude. Women come in with gobs of makeup, dangling earrings, gobs of perfume.