"Mapometer.com (short for mapping pedometer) is an international site providing runners, cyclists and walkers with an easy way to measure the distances of their runs, jogs, rides, walks and hikes using Google maps. It also provides training logs, altitude and elevation measuring and the ability to share routes. Used by athletes worldwide as a tool to train for marathons, half-marathons and triathlons and occasional joggers, mountain bikers and sports men and women to see how far they are going and keep fit. "

Charles River
Ran this wearing a Wharton T-Shirt which adds a certain element of risk to the entire endeavour that probably burnt me a few extra calories.
Only joking. The Harvard guys saw the T-Shirt and just smiled.
Distance 5.05 Miles
Energy used