Matt Prendergast
Henrik Kristoffersen already knows when a run feels fast. Protern helps show why. He and Stratton Mountain School coaches explain how video, GPS and analytics reveal where speed is gained, lost and recovered.
Peter LangeOct 08, 2026
Henrik Kristoffersen already knows when a run feels fast. Protern helps show why. He and Stratton Mountain School coaches explain how video, GPS and analytics reveal where speed is gained, lost and recovered.
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