Today, I did something that I haven't done in a long long time. I quit in the middle of a workout.
Actually, saying it was the middle of the workout is really generous. It was more like 600 yards into a 3000-yard swim. I did my warmup, and got going on my main set, which started with 10x100. It was just too much. I got through 2 of them, flailing around, exhausted, and feeling the lactic acid already building up, and I knew it was going to be bad. I was in the shower before I consciously realized that I had quit on a workout.
I'm okay with it, though. The extra rest day will be good, and once finals are really over (probably tomorrow), I can refocus.