By eHow Sports & Fitness Editor
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A triathlon is a competition in which athletes swim, bike and run. The Ironman triathlon is an ultimate endurance challenge that includes a 2.4 mile swim, a 112 mile bike, and a 26.2 mile run. Ironman triathlons are only for athletes who are serious about training. It should not be attempted by beginners. Read on to learn more.
eHow Sports & Fitness Editor