Short recap. Did the 2009 Walt Disney World Marathon this past weekend. My ideal running temperature is 50-60F, but the forecast was a low of 55F and a high of 80F. Thus, knowing it would be too hot, I went out fast and did the first half in 2:29 - which is 15 minutes faster than my target. But then it got hot and I began to walk. Ended up doing a 3:07 second half for a total of 5:34, just 6 minutes off my personal record.