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Norwegian 4x4

technique 1 mention from 1 sources

A high-intensity interval training protocol consisting of 4 intervals of 4 minutes at high intensity with recovery periods between.

training cardio hiit heart health
1

sources

Mentioned by

Tim Ferriss

All mentions

Tim Ferriss mentioned ✓ High confidence
"So, he put him on a 2-year training program which involved the Norwegian 4x4. By the end of the two years, these people were working out about five hours a week."
From: How to Reverse 20 Years of Heart Aging — Dr. Rhonda Patrick #health #longevity • ▶ 0:25 • Feb 2026

Attribution: Tim Ferriss is describing a study that used the Norwegian 4x4 training protocol, presenting it in a positive context as part of successful heart health intervention