I happened to be out on a training ride and saw the races at Lagoon Valley, near Vacaville, CA. Wow. A lot more challenging than I thought. My club was sponsoring the races, so one of my fellow members tried to talk me into entering. No way, not any time soon. Those racers were kicking butt. I'm not in good enough shape yet to ride that kind of race. Lots of climbing on dirt? Maybe someday, not today.