Koen ran with a Stryd on the laces of his Hoka One One Carbon X2 shoes. The readers of our books and our articles undoubtedly know our running model, which states that your performance is determined by the sum of the running resistance Pr,the air resistance Pa and the climbing resistance Pc. ...

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Polar innovations In 2019 Koen Demyttenaere of Polar asked us to test their new Polar Vantage V watch. We found this very interesting, especially since the Polar Vantage V also gives your running power in Watts. We published our findings in two previous articles, part 1  and part 2. The Polar Grit X is the robust brother of the Polar Vantage V. In...

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What should be my target power for a virtual race? We often get this question. More and more runners are getting acquainted with running on power. That’s not complicated. It’s new and therefore sometimes unfamiliar. But very suitable for virtual races. You’re running alone. You can’t focus on anyone and you don’t have a...

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Storm Evert swept over the Netherlands on Thursday 11 March 2021. “Heavy wind gusts of 80 to 90 kilometers per hour occur throughout the country, and in the north and west from 100 to 110 kilometers per hour. The peak falls in the last hours of the morning and at the beginning of the afternoon. The storm is expected to move away around 2 p.m.” Ron...

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Ron and Hans during a Netherlands Championships Masters at the Utrecht athletics track Maarschalkerweerd This week is was 7.5 years ago when the first article by Hans and Ron appeared on ProRun. Since then they published a new article every week. With explanations about aspects that affect your running performance or with good analyses of current sports...

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