Norwegian 4x4: once a week max
The gold-standard Norwegian 4x4 VO2 max protocol — 4 minutes on, 4 minutes off — should only be performed once a week at most.
Snapshot
From The Diary Of A CEO with Steven Bartlett · May 8, 2026
The gold-standard Norwegian 4x4 VO2 max protocol — 4 minutes on, 4 minutes off — should only be performed once a week at most.
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