Norwegian 4x4 Protocol: Boreas

Name: Norwegian 4x4 Protocol: Boreas
Rating: 4.8 (39 reviews)
Author: Havard Tryman

By: Havard Tryman

Interval training for VO2 max

Features & Capabilities

Get started with Norwegian 4x4 interval training.

Norwegian 4x4 Protocol: Boreas makes it easy to get started with the Norwegian 4x4 protocol. Just select warm-up and cooldown duration, and the app handles the rest. You can connect an Apple Watch to track your heart rate and calories. The app supports voice guidance to let you know when the interval is about to end and when the next interval starts.

Features: • Perform Norwegian 4x4 workouts. • Know when the next interval starts while the app is in the background with voice guidance. • Get current heart rate, heart rate zone and calories from your Apple Watch. • Save your workouts to the Health app. • No sign-in is required.

Norwegian 4x4 Protocol: Boreas is a HIIT interval timer for improving cardio, which is relevant if you're training for 5k, 10k, half marathon, marathon, improving VO2 max or general fitness.

If you have a suggestion for how to improve Norwegian 4x4 Protocol: Boreas, feel free to contact the App Support email.

Always consult with a healthcare provider before starting any new exercise program. Exercise can carry risks, especially for people who have certain medical conditions or who have not been physically active in a long time. It's important to understand that using this app does not replace a doctor's advice or treatment.

User Growth & Download Statistics

App

By:

Havard Tryman

Rating:

4.80

(39) 1 new ratings

Version:

1.3.1 Last updated: 2026-05-14

Version code:

885681929

Creation date:

2025-08-26

Compatible devices:

Size:

8.58MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-10

Compare stats and ranking:

Ranking

# 211,618 ▲ 1,528

For Developers

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Contact the developer

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Developed by:

Havard Tryman

Apple Apps Store

https://apps.apple.com/us/app/norwegian-4x4-protocol-boreas/id6751464534

Website:

https://www.norwegianprotocol.com/

User Reviews

Just redownloaded the app and it now gets heart rate info and the workout automatically began on my watch. Impressive.

by Ch*****, 2026-02-25

I recently decided to try the Norwegian 4x4 protocol due to its well-documented benefits for cardiac health. This simple app works great for me! During energetic walks, I can listen to an audiobook, and the app sends brief notifications to start a new slow or fast phase. It picks up my heart rate from my watch and, at the end of the workout, displays a heart rate graph showing how well I met the max heart rate guidelines: 70% for the slow phase and 85-95% for the fast phase. The workout is sent to your iPhone’s Health Data. At some point the app failed to get HR data. (Perhaps there was an iPhone update). It turns out you have to give it permission to get the data. Go to Settings->Privacy and Security->Health->Boreas and turn on options as needed. I enabled Heart Rate and others.

by 4x*****, 2026-01-14

Allegedly tracked heart rate, but it’s not live lags quite a bit and I bought this because I thought it was gonna give me coaching if my heart rate was too higher too low to make sure I hit my heart rate without having a painter. Look at things forward working out. Couldn’t try that feature until I bought it, though which kind of ticked me off.