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How to Avoid Blowing Up with Correct Pacing

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Pacing in endurance sport is one of the most essential aspects of performance. Regardless of your ability, if you start the race beyond your level of fitness you will slow down at the end. The severity of how much you slow down (blow up) will depend on the race duration and how far beyond your ability you went at the start. Heat and Glycogen: Two Factors Slowing You Down In some cases, the amount you slow down may be so drastic you are forced to stop. Blowing up can occur for two reasons. Heat:. You can only handle small variations in core temperature (97 °F (36.1 °C) to 99 °F (37.2 °C)). If you accumulate heat at a rate faster than your body can cool itself, you'll be forced to slow down to avoid heat illness.
Sugar: As humans, we can only store a few 100 grams of glycogen (sugar) in our muscles and liver. We use glycogen aerobically and anaerobically as a high octane fuel for situations where fat can’t be used to produce energy fast enough. Starting too fast can use up your hig…

Why you shouldn't look at Strava's new fitness score

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"It pretty much makes no sense at all"
Strava released fitness tracking for mobile devices to "summit" members in September 2019. Initially, this sounded like a great feature, however, they've decided to ignore fatigue..!?! Strava has had fitness and freshness tracking on the desktop version forever, and it's a great feature because it maps both fitness and fatigue. Yet, for some reason, Strava has decided to offer a far less relevant version on the mobile devices. My recommendation is to stay away from Strava app fitness.


If you're interested in tracking your training I recommend using TrainingPeaks. Checkout my tracking fitness video here; https://youtu.be/OpvvWll87QU

Listen to the training with heart rate podcast

Analysing My 8hr 38min 100km Run

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I had an amazing run at the Trail Trilogy 100km ultramarathon. Overall, I am incredibly happy with my effort and I am glad I implemented my 19-1 run-walk strategy, which I believe saved me on multiple occasions. HOWEVER, I felt like everything went to plan except for two sections. Looking back through my data, those two sections do stick out at me and I’d like to show them to you.



Here is the raw output from TrainingPeaks, the software I use to analyse training files. To the untrained eye, it may look like a bit of a mess, but with a little background information, you can unlock a world of information. I’ll show you.


Everyone slows down in an ultra
First, if you clear out some of the excess data and only show heart rate and running power, you can see that I slowed down over the duration of the race.
The rate at which I slowed down fits nicely into the results published in a 2004 study titled “Changes in Running Speeds in a 100 km Ultramarathon Race” (read here).
The researchers showed…