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A Better Power Algorithm, Free Coaching, & Hintsa Well-Being

· By Scott Semple · 1 min read

A photo of an open book, the start of chapter 4.
Page 56 of Power to Trail & Ultra Runners, by Dr. Markus Holler. His book explains training with power, some new useful metrics, and the philosophy behind his RunPowerModel.

Trail Running With (Reliable) Power

Using power as a training metric for trail running is ideal. Pace is best for flat roads, but variable terrain makes that impossible for trail runners. Until recently, an accurate algorithm for running power didn’t exist.

But now it does: Garmin users can use RunPowerModel by Markus Holler. To start using it, add it to your data fields (for free), and set a run-specific threshold.*

* Don’t know your rFTP? Use Joe Friel’s 30-minute test. It works for both power and heart rate.

Free Coaching & A Well-Being Assessment

About the author

Scott Semple Scott Semple

Climber, skimo racer, coach. In skimo, I was on the Canadian National Team and competed at the ISMF World Championships. As climber, I was sponsored by Black Diamond, SCARPA, Clif Bar, Adidas Eyewear, and others.

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Updated on Nov 9, 2025