Norwegian 4x4

Science-backed HIIT training app based on the Norwegian 4x4 protocol

Mobile appfreemiumglobal

Norwegian 4x4 is a HIIT training app that guides users through the science-backed Norwegian 4x4 protocol — four-minute intervals at 90-95% max heart rate — to boost VO2 max and cardiovascular health. It's aimed at people who want to follow this specific high-intensity protocol accurately rather than guess at timing and pacing themselves.

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