I started running at 7:30 and it was cold. Like in the 30’s cold. Even though I was in the 3 hour pace group, it was crowded for the first 15 miles. Chicago is a flat course but there are lot of turns which means lots of slowing down and speeding up. I felt great until mile 24 when my left hammy and calf started tightening up. I thought I could run through it but with less than a mile to go the hamstring cramped and I was forced to stop and stretch. I managed to start running, kept the 3:00 pace guy in my sights and caught up with him with about 100 yards to go. I finished running at 10:29.