When trouble started

We drove the Boston Marathon course on Thursday before the race, and I admit I was a little shocked at the really steep start and rolling downhill for the first 7 miles. We had a good plan of running conservative through that stretch, but as I came off these first miles I knew that my legs were not feeling right. I wasn't breathing hard, but I could not pick up my legs. It was a feeling I have never experienced in the early stages of a marathon. Since my coach had said it was important to get to the hill section at mile 17 feeling good, I knew I was in trouble.