I was having some stomach problems Wednesday and Thursday along with a stiff neck. I think the "thing" might have been a slight case of stomach flu or it could have been something I ate. No fever but I was tired and I had other symptoms that I won't bother to describe. I know that I did not feel decent Wednesday and probably should not have even tried to run faster. Usually I am quite business like and just go do my workout but that evening I kept procrastinating.
There is a message there.
I felt well enough today to run a slow 7 miles.