Random Riddle: 12-11-2014

In this race I will never lose, no matter the shape of your running shoes. Run all day, run all night. I promise still I will outlast your fight. I need no rest, no water, no food. I am sure I would like you; I’m not trying to be rude. So stop now while you’re ahead. The only time you’ll beat me is when you’re dead.

What am I?
 

Riddle