Every summer, the world's top motocross racers come together for the grueling 12-race AMA Outdoor Motocross Championship Series to battle the heat, the tracks and each other. These are just a few of their stories.<br /><br /><br /><img src="http://ll.broadbandsports.com/images/33754_thumb.jpg" alt="Inside the AMA Outdoor Motocross Championship Series - Dirty Work" title="Inside the AMA Outdoor Motocross Championship Series - Dirty Work" width="150" height="90" alt="Inside the AMA Outdoor Motocross Championship Series - Dirty Work"/>
