How many calories did you burn??

Are you curious how many calories you burned when you went running today? Try out this calculator that estimates how many calories you burned based on your weight and how far you ran. I know this probably isn't completely accurate because everyone has a different metabolism rate, but I'm sure there is some truth to it.

http://runnersworld.com/channel/0,7119,s6-242-0-0-0,00.html?location=_*topnav*