Saturday morning for me in Salt Lake City. It's partly cloudy and 42 degrees. There is next to no humidity. This is one of those days where if you were to be running a marathon, and are trained well, you are probably going to set a huge PR.
I am hoping those running on Monday have that mindset. If the current weather forecast stays the same, use your head. If you forget to use your head and you find yourself in some dire straights, there is nothing wrong with a DNF. "DNF" usually means "Did Not Finish". It is dreaded by many. It is deemed to be the utmost of horrible things. However, to me, "DNF" sometimes means "Do Nothing Foolish".
Boston is wonderful. It is historic. It means so much to so many people. But it is just a race, people. Remember that. If you find yourself needing to stop, do it. Your long-term health and long-term running career depend on you being able to use your head when you body is not working. I absolutely promise you that there will be another race down the line.
Let's have you around to finish it, OK?