Scientific Triathlon

Scientific Triathlon Scientific Triathlon is all about helping you and other age-group triathletes train smarter and achieve your triathlon goals. Train smart!

-Mikael Eriksson

Ready to get fitter and race faster? You've found the right place if you want to:

-Get started in triathlon without feeling overwhelmed
-Improve your swim, bike and run fitness and race faster or go longer
-Achieve great overall health and well-being by managing your nutrition and recovery, and by finding a good balance between training and other obligations

Hi, I'm Mikael, the face behind Scie

ntific Triathlon! My goal with Scientific Triathlon is to give you the tools and resources you need to reach your triathlon goals, big or small. Whether you want to use triathlon as a vehicle to get in shape and lose weight, or you want to win your age group in a competitive race, the content you'll find on this website (including the Blog and the Show) and in the emails I send can help. You'll find tons of valuable information on how to train smart using and with structure to get the most bang for your training buck, how to avoid injury and overtraining to be able to train consistently without setbacks, how to avoid stagnation and break through performance plateaus, how to manage your training and balance it with your family and work commitments, and lots more. These are just some of the challenges that age-group triathletes face, and my hope is that the actionable and comprehensive content on Scientific Triathlon can help you overcome these challenges. What makes Scientific Triathlon stand out among other triathlon sites is the quality of the content. You won't find many 500-word articles here. When I cover a topic, I do it properly. The reason for this is that I don't want you to just consume the content here and forget about it five minutes later. I want you to really be able to apply the things you learn in your triathlon training, so the content is designed to give you the complete picture, but still be actionable and comprehensive. My articles have also been featured in many popular triathlon magazines and media outlets like Triradar, Beginner Triathlete, and others. Finally, I just want to say that Scientific Triathlon is not about me, it's about you. If there's any topic you think I should cover in one way or another, let me know right away. Some of the most valuable content around here has resulted directly from reader feedback. Thank you for being a Scientific Triathlon reader. I look forward to getting to know you!

27/08/2026

🌡️ The gold standard for measuring core body temperature is a temperature pill you swallow. It costs about £50 and you get one use (unless you "hack the system" to get two uses out of it like Jack explains here).

Jack has used temperature pills and the CORE sensor in a heat chamber, and his verdict was that the CORE was not all that accurate but is better than nothing, and it's a good practical solution due to the cost of core temperature pills when you do multiple sessions.

There are also completely free metrics you can track. Sweat rate is easy to track, and should increase as you get more heat adapted. Heat RPE on the other hand should go down for the same heat session repeated over time (or stay the same for increased heat or output in the same heat), and Jack rates this as the most important thing to track.

For more on this, and a whole lot of other topics and listener questions, listen to the latest episode of That Triathlon Show

13/08/2026

🚴 Two of the biggest position trends of the last few years, high aerobars and the long Superman, and the aero consultant testing them says the mechanism people believe in is the wrong one.

It is not the arms blocking redirecting airflow, and it is not the extra length. Both changes make it easier to drop your head, and head position is where Marc Graveline sees the biggest single impact on drag. Hold the head in the same place and go long anyway, and he says the gain stops showing up.

Which is also why he films riders before he tests them.

Full episode with .graveline out now, link in bio.

07/08/2026

🤕 In 5,205 runners, across 18 months of Garmin data and 588,071 runs, the thing that best predicted an overuse injury wasn't the increase in weekly mileage nor the acute:chronic workload ratio (or TSB, ATL etc). 

It was going longer in a single run compared to the longest run of your previous 30 days by at least 10%. Ten to thirty percent longer came with a 64% higher injury rate. More than 100% longer led to a 128% increase in injury risk.

Observational data, so association rather than proof of cause, and injuries were self-reported. But the practical version is simple: don’t increase the distance of your longest run in big jumps or even moderate jumps, make the increases small steps instead. 

Episode 709 (the August Research Roundup) is out now on Spotify, Apple Podcasts and YouTube, and on scientifictriathlon.com/tts709/

16/07/2026

Paul Booth is the nutritionist and physiologist who worked with both the male and female winners of UTMB in 2025. He argues that endurance sport went from the keto era straight to the ultra-high-carb era, with people now chasing beyond 120 grams of carbs an hour.

Paul has spent years trying to prove that ultra-high carb works, and says the data simply isn't there. He calls himself a 90-gram of carb guy (NB. 90 grams of carbs per hour). There's a ceiling to how much you can actually use, and it sits lower than most people think.

❓How many grams of carbs per hour do you typically consume in your key races?
(My answer: 100-110 g/h)

02/07/2026

Jack Kelly hates the fear-mongering about fatigue and obsession with words like "absorbing" training and recovery he perceives as pervasive myths in the triathlon world.
For a big deep dive into Jack's coaching and beliefs about training, listen to episode 704 of That Triathlon Show!

30/06/2026

A familiar voice in the triathlon world is the next interviewee on That Triathlon Show...

New episode coming this Thursday at 5am UTC/GMT. Be sure to plan at least 2h10 minutes of training for the day!

25/06/2026

A crit racer came to Kolie Moore with a 330-watt FTP and no crit-specific training. They cut his FTP-work for repeated sprints and strength. His FTP dropped 10 to 15 watts. His racing took off. More watts isn't the same as faster when you're lacking key aspects of the demands of the event you're training for.

Kolie rated “Event Specificity” as an underrated performance factor in this episode of That Triathlon Show. Listen in to hear what else is on his list of overrated and underrated factors.

25/06/2026

A crit racer came to Kolie Moore with a 330-watt FTP and no crit-specific training. They cut his FTP-work for repeated sprints and strength. His FTP dropped 10 to 15 watts. His racing took off. More watts isn't the same as faster when you're lacking key aspects of the demands of the event you're training for.

Kolie rated “Event Specificity” as an underrated performance factor in this episode of That Triathlon Show. Listen in to hear what else is on his list of overrated and underrated factors.

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