“The Ironman triathlon coming to Chattanooga, Tenn., in September sold out 2,500 slots in under a minute. The Hits triathlons feature races exactly as demanding: a 2.4-mile swim, 112-mile bike and 26.2-mile run. The events have averaged just 30 registrants this year. It's hard to see much difference between the two beyond the logo. As Ironman races swell in popularity in North America with more weekend warriors competing, rival races are popping up. They are finding, though, that it can be hard to attract competitors without the name Ironman, even with lower entry fees. Meanwhile, the Ironman series, run by World Triathlon Corp., which owns the Ironman trademark, has ballooned to 35 global races, many with waiting lists. ”