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Norwegian 4×4 workout for runners: the complete guide to boosting your VO2 max without getting injured

Norwegian 4×4 workout for runners: the complete guide to boosting your VO2 max without getting injured

If you follow running news, you’ve probably seen the Norwegian 4×4 workout everywhere lately. This high-intensity protocol, developed by Norwegian researchers decades ago, has become one of the big trends in 2025 thanks to its ability to improve VO2 max, cardiovascular health and endurance in less time than traditional steady-state runs. In this guide, you’ll […]

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