At the gym where I do spinning the same room is used for aerobics, Zumba, spinning, yoga, etc. Inevitably, a class will run over or an instructor will be late. The result is that by the 3rd or 4th class of the morning, starting times are backed up by 10 minutes or so; there is a crowd in the hall waiting for the room to clear out to start the next class. Some of those waiting give dirty looks to those exiting from the previous class. As my spin class, which always runs over because we start late, is followed by yoga, we spinners have started calling the yoga class "Angry Yoga." A few of the yogis definitely need a namaste, an om or some breathing to get themselves peaceful!