Ironman California 70.3 has been one of the most popular North American triathlons for many years. And nearly 3,100 athletes registered to enter the race. But a staggeringly high number of entrants did not start -- DNS was 25% overall. It may be the highest DNS we've observed across the hundreds of triathlons we've analyzed over the years. Of those who started, 5% did not finish, which is fairly typical in half or full ironman triathlons.
Here are the details overall, by age group, compared with 2010, and more.