Well...I had a royally crappy run yesterday afternoon. I felt terrible...but I did my two miles. And the second I stepped off the treadmill, I got a massive migraine. And then I threw up. And then my migraine continued for several hours.
And...well, that was pretty much my entire evening. I'm pretty bummed out about my run, but...I read enough other runners' blogs to know that a crappy run isn't that atypical.
But I wonder why? Why are some runs great, and feel incredible...and others are the exact opposite? This is my first bad run and I'm just interested in why that happens. I didn't even feel good afterwards - like I had just completed a great workout.
Thoughts? Advice? Opinions?