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“We can open Kristian’s hips more and flatten his back to help lower his CdA ( coefficient of drag) and at the same time increasing his highest sustainable power output.”Īdditionally, if his Strava file is to be believed, the bike course was a mile long. Under ideal conditions, with a dry track, it is our belief he could have gone more than five minutes faster on the bike.”Īnd from a training and aerodynamics standpoint-as is the case for many first-time Ironman athletes-the Norwegians believe there are still further gains to be made: “We know we can still optimize the bike further,” Alexsander Bu said. Olav Aleksander Bu, Blummenfelt’s coach on the ground and a coach with the Norwegian team, said this exacerbated an issue his athlete already had with tires going into the race: “We were not able to get the correct tires due to an error and we ended up having to fit butyl tubes inside the tubeless tires, which added to the rolling friction. Some parts of the bike course were water-logged with up to eight inches of water, obviously causing athletes to slow down. 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?”