OD comment

Here's an excerpt from the runner's booklet.  It eventually goes on to list several tips.

The Old Dominion is traditionally held on the first truly hot and stinkingly humid day of the year in Virginia. For those who have trained in such heat and humidity~ the race is challenge enough. For those who have not, the American College of Sports Physicians recommends against participating in such an event. But assuming that you are crazy enough to be reading this and are planning on running the race, the following are some important tips from your friendly medical director.