spinning 1:00:11 
Saturday morning spin. This class continues to puzzle me. I showed up 10 minutes before the class started, which is usually considered early, and all but 3 of the bikes had peoples waterbottles or bags at it - but almost no people (they came in just before the class started). And all the people in the class seem to know each other. They're all about 60 and fit. Maybe they're a cycling group that always books this class together? This class also books up in less than 1 hour after the booking opens, and typically had at least 30 people on the reserve list (there are about 30 bikes). However, for all spinning classes there are two spots that aren't bookable,and they go first come, first served in the morning. These often aren't filled up, because who wants to go all the way to the gym only to discover that you can't actually get into the class? But I've taken one of these two spots for the last month, and it's worked great. Today was actually the first time that the class was completely full - previously there have been one or two empty bikes.
Anyway, despite the mystery of this class, I worked hard. First two building intervals, then 2', 2', 1', 1', 2', 1', 2', with a minute rest after the 2min and 45s rest after the 1m.
Maybe slightly too hard in the beginning as my legs were jelly at the end. HR up to 177 on most of the intervals and then just went all out on the last one and hit 182. Don't have the HR data myself, since I need a new battery for my watch, but it was a pulse class, so they give you HR monitors and project it up on a screen.