The X up is a BMX trick that involves crossing the arms in midair. Learn more about the BMX X up trick from a professional BMX rider in this free biking video.<br /><br /><br /><img src="http://ll.broadbandsports.com/images/18730_thumb.jpg" alt="BMX Tricks: X Up" title="BMX Tricks: X Up" width="150" height="90" alt="BMX Tricks: X Up"/>
