Uh oh

I woke up this morning planning on doing the Next Big Run: this one is supposed to be 18 miles. But for some reason my left shin feels really bad. It's not quite painful, but it's definitely "discomfort with extreme prejudice". It;s odd because it felt fine after Thursday's run and it wasn't bothering me yesterday.

I'm hoping it's just some temporary swelling and I'll be able to go out tomorrow. Or I may have to skip the long run entirely this weekend, which would definitely put me behind schedule. I'm not yet worried about not doing the L.A. Marathon, but I am now... concerned.