And then it rained.
Naturally, I slipped in the way to work. Luckily, I didn't hit my head, but I was pretty sore. I managed to limp to the bus stop and go to work.
I was still sore in Friday - to the point where I was wondering if I should go to boxing or, if I went, whether I should skip. I ended up going and skipping, didn't hurt, so I did that, too. It worked, too - I wasn't sore all weekend.
And then I did a strength workout on Monday. I've been sore ever since. I'm not even sure if it's a muscle issue, or a tendon, ligament, or even bone. I hope whatever it is goes away soon, though.