Norwegian 4x4 Heart Rate — ASO

By Abe Stanway on AppTrack Ninja.

VO2max interval timer with HR

Norwegian 4×4 is the Helgerud VO2max interval protocol, built for athletes who want to push their aerobic ceiling. Connect any Bluetooth heart-rate monitor — Whoop broadcast, Polar H10, Wahoo TICKR, Garmin HRM, or any device exposing the standard heart-rate service — and the app guides you through a 5 min warm-up, 4 × (4 min hard / 3 min easy), and 5 min cool-down. A live heart-rate gauge shows when you're in the target zone (85–95% HRmax during work intervals, 60–70% during rest). The app speaks "Speed up" or "Slow down" until you hit the zone. Audio cues mark each phase transition; a 9-seco…

Categories: Health & Fitness

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