Painfully. A couple weeks ago I did 2 hours at the gym, my post-ride notes:
115 degrees out, headed to the gym for another round with Stages SC3 bike #26 right next to the awesome fan.
55 minutes solo and then spin class started. Did my own thing while the instructor did her motivational speaking. It worked and I pushed thru the mental and butt barriers for 2 focused hours of work.
The people watching is priceless.