# Norwegian 4x4 Heart Rate

> VO2max interval timer with HR

Canonical page: [https://chrome-stats.com/d/id6770760726](https://chrome-stats.com/d/id6770760726)

## Overview

- **ID:** `id6770760726`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Abe Stanway
- **Category:** Health & Fitness
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.1
- **Last updated:** 2026-05-22
- **First published:** 2026-05-21
- **Size:** 885 KB
- **Data as of:** 2026-09-25
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/norwegian-4x4-heart-rate/id6770760726)
- **Privacy policy:** [https://github.com/astanway/hiit/blob/main/PRIVACY.md](https://github.com/astanway/hiit/blob/main/PRIVACY.md)

## Description

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-second countdown gives you time to start working out.

All data stays on your phone. No accounts, no analytics, no servers.

## Rankings

- #891,872 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6770760726)