Norwegian 4x4
Software / App
A high-intensity interval training protocol involving 4 minutes at 85-95% maximum heart rate, followed by a 3-minute break, repeated four times. Used for improving VO2 Max.
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Videos Mentioning Norwegian 4x4

Women’s Fitness Expert: What You NEED To Know About Dieting & Exercise | Dr. Stephanie Estima
The Diary Of A CEO
A high-intensity interval training protocol involving 4 minutes at 85-95% maximum heart rate, followed by a 3-minute break, repeated four times. Used for improving VO2 Max.

Q&A with Tim — The Art of Male Friendship, Reinvention in The Age of AI, & More
Tim Ferriss
A type of interval training that has shown significant benefits for cognitive health, with three times per week for six months providing approximately five years of benefits.