When it comes to triathlon, a sport that has helped fuel the popularity of cycling in the U.S. and around the world, the biggest hurdle for most potential triathletes is the swim. Did you know that there’s a way to be a multi-sport athlete and avoid the swim altogether: Do a duathlon. There’s no swimming in duathlon, just running and cycling. It’s a sport that is apparently growing in popularity. USA Triathlon reported last week that registrations for the 2009 USA Triathlon National Duathlon Festival in Richmond, Va., which is scheduled for April 25-26, have already eclipsed last year’s numbers and are expected to set all-time records. “This is looking like a break-out event that has the potential to be the largest duathlon ever organized in the United States,” USA Triathlon National Events Director Jeff Dyrek said in a statement. USA Triathlon reports that registrations for the Duathlon Festival weekend – which includes off-road races and citizen races – are currently at 783 total athletes, with 636 slated to compete in the National Championship race. Last year, 450 duathletes from around the country competed in the weekend of events. Sounds like a lot of cyclists are diving into this sport — without even having to get wet.