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Norwegian 4x4

Use the Norwegian 4x4 protocol to improve cardiorespiratory fitness: 4 minutes hard, 3 minutes recovery, repeated 4 times.

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“The Norwegian 4x4 is a hard workout. It's really good for improving your cardiorespore fitness... where I'm going as hard as I can for four minutes and then recovering for three minutes and doing that four times.”

huberman · The Best Vitality & Health Protocols | Dr. Rhonda Patrick · Mar 23, 2026 · 8:01 · open ↗

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