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Norwegian 4x4 protocol
technique
High intensity interval training protocol involving 4 minutes at 85-95% max heart rate, repeated 4 times with rest periods.
Also mentioned
(1)
Casual references without a clear endorsement
Tommy Wood
mentioned
"The HIT group did the Norwegian 4x4 protocol. It's 4 minutes of running at 85 to 95% of maximum h..."
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