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More than 4,500 athletes are getting ready to compete in two days of half-Ironman action as the Ironman 70.3 World Championship draws nearer in Chattanooga, Tenn. Thursday’s pre-race activities included swim course recon, athlete registration, the Parade of Nations and expo browsing. See some of the action above and check back to Triathlete.com over the next few days for more from Chattanooga.