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Why Do They Swim-Bike-Run So Fast? Data.

In November, under stormy, tropical skies, the reigning Olympic men’s triathlon champion, Kristian Blummenfelt leapt from a pier into the Caribbean Sea. Then, 7 hours 21 minutes 12 seconds later, after swimming 2.4 miles, cycling more than 112 and running 26.2, he snapped the tape to win the Cozumel Ironman in Mexico and become the fastest ever at the Ironman distance.

Never mind that it had been his first attempt at the distance or that he had diarrhea for days beforehand. On the run, he ducked into a portable toilet twice, costing him over 90 seconds, and he still clocked a 2:35:24 marathon.