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Built like a Viking: Science-backed benefits of the Norwegian 4x4 workout method - The Manual
https://www.themanual.com/fitness/built-like-a-viking-science-backed-benefits-of-the-norwegian-4x4-workout-method/
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The Norwegian 4x4 method is a type of cardio workout featuring four rounds of hard four-minute intervals. You’ll rest for three minutes between each interval.
