Spoiler alert: Setting aside their phenomenal talent, the answers, from a training and physiology point of view, are far simpler than you might think… Blummenfelt’s Cozumel bike performanceĪt Ironman Cozumel on Sunday, Blummenfelt posted an impressive 4:02.40 bike split in conditions that were less than favorable for fast times. We also asked Blummenfelt’s coach for some additional insight. The data comes from their publicly available Strava files and training logs. We reached out to exercise physiologist, data analyst, and coach Alan Couzens to help us look at what it took from a training and physiology standpoint for Blummenfelt to nail a 7:21 debut Ironman and Iden a 2:34 debut Ironman marathon. ![]() ![]() The recent Ironman debuts of Norwegian teammates Kristian Blummenfelt and Gustav Iden have not only seen world best times come tumbling down-they’ve also led to plenty of jaws dropping and folks asking: “How on earth did they do that?”
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