Today I started out bright and early for a 20 miler... but my left hamstring was tight when I started out (it has been for a couple days). Thought it would get better after a couple miles (it has in the past), but no... At about half a mile in, it went from tight to OW. I stretched a bit, walked a bit, and it felt better for a while, then Ow again. So 20 miles turned into three. I'll try again tomorrow, maybe...