The frustration builds when you're waiting in line for the communal shower. At my local gym, there were 12 communal showers, but it was common for a class to b

The frustration builds when you're waiting in line for the communal shower. At my local gym, there were 12 communal showers, but it was common for a class to be scheduled with an end time at 6:00 or 6:30 on the dot, so in addition to the steady traffic from the pool, weight room, or the ergs, you'd have a sudden exodus of 20 or 30 guys (or 50 in January) all waiting in line for showers so we could get to work on time. Then (in spite of signs prohibiting phone use in the locker rooms) people started using their phones for messaging/emails, usually conspicuously held within the locker or otherwise aimed so that they couldn't be used for photos...then they converted the showers to 8 private cubicles. Even with 8 instead of 12, it was no big deal if people were taking 3 minutes to rinse off the sweat. Whether you left at 6:33, 6:36, or 6:39 was not a problem. But if 10 or 20% of people were treating the shower like a sauna, luxuriating in the steam until their fingers and toes got wrinkly, throughput went down the drain along with those gallons and gallons of hot water... you might have to wait until 7:00 to take a shower after your 6:30 spin class. Putting a lightswitch which had a 10-minute timer outside the cubicle, plus a sign urging users to conserve water and take showers shorter than 5 minutes, was a big improvement. However, lots of people would do everything they could to minimize perceived awkward nakedness in the communal showers, getting clean in record time, but feel no such pressure in a cubicle.