A discipline in triathlon is commonly referred to one of the three main triathlon sports: swimming, biking or running. Disciplines in triathlon come in numerous lengths and durations. In an Ironman distance, the bike portion is 112 miles, while in a Half Ironman, the bike split is 56 miles. In an Olympic distance triathlon, the run is generally a 10K, while in a PTO triathlon, the run is 18K.
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