Harder than it should have been...

I set out today to run 4 miles, but for some reason, nothing was in sync. It was cold, but I had on too many layers and felt weighed down. My knee started to hurt, which has never happened before, by the end I was sort of limping. That had me really worried b/c I am supposed to run a race this Saturday. All in all, I ran 2.2, and walked .8.