For more training tips, blogs, features and more, check out Active.com's Triathlon section.<br /><br /><br /><img src="http://ll.broadbandsports.com/images/science2.thumbnail.jpg" alt="Science Behind Over-Reaching - Expert Dave Scott" title="Science Behind Over-Reaching - Expert Dave Scott" width="150" height="90" alt="Science Behind Over-Reaching - Expert Dave Scott"/>
