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Norwegian 4x4 Protocol: Boreas

Norwegian 4x4 Protocol: Boreas

Interval training for VO2 max

56 ratings
8 reviews
💪 Health & Fitness
⚽ Sports
Free
In-App Purchases

Details

  • Released
  • Updated

Features

Developer

Havard Tryman
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About

This app guides you through the Norwegian 4x4 interval training protocol to improve your VO2 max and cardiovascular fitness. It offers customizable warm-up and cooldown durations, voice guidance for intervals, and integrates with Apple Watch for heart rate and calorie tracking.

✓Norwegian 4x4 workouts
✓Voice guidance for intervals
✓Apple Watch heart rate tracking
✓Calorie tracking
✓Save workouts to Health app
✓No sign-in required
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What's New in Norwegian 4x4 Protocol

1.4.4

August 15, 2026

Improvements and bug fixes

Subscription plans

Pro

Unlock Pro features

$24.991 Year
How to cancel Norwegian 4x4 Protocol subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Insulting business model

Offering two subscription plans, one EXTREMELY weekly expensive plan to push the user to buy a (still expensive) annual plan is spitting on the user’s face.
ab78c3aaa3a39163ab78c3aaa3a39163

More options

Please add more exercise options
ToasterSav7ToasterSav7

Best App for Norwegian 4x4

This is by far the best app for doing the Norwegian 4x4 training. The alerts help to let you know how much time is left and it works flawlessly.
7gregory7gregory

Best Norwegian 4x4 app with incredible dev support!

I downloaded a half dozen 4x4 apps and this one was definitely the best, but it was missing the ability to start the intervals at less than 1 minute (worried I’d give myself a heart attack lol), and he replied almost immediately and implemented the change the next day! Incredible!
moogleslammoogleslam

Response from developer

Thank you for the review!

It finally works!

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

Response from developer

Thanks for the review!

See 3 more reviews

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FAQ

What is the Norwegian 4x4 Protocol app?

The Norwegian 4x4 Protocol app guides you through a specific interval training method designed to improve your VO2 max and cardiovascular fitness. It allows customization of warm-up and cooldown periods, provides voice cues for intervals, and syncs with your Apple Watch.

Does Norwegian 4x4 Protocol have ads?

No, the Norwegian 4x4 Protocol app does not contain advertisements. It is free to download and use, with optional subscription plans for enhanced features.

What devices does Norwegian 4x4 Protocol support?

Norwegian 4x4 Protocol is available on Apple Watch, iPhone, and iPad, offering a seamless experience across your Apple devices.

How does Norwegian 4x4 Protocol help with VO2 max?

The app implements the Norwegian 4x4 interval training method, which is scientifically proven to be effective for increasing VO2 max. This protocol involves high-intensity intervals followed by recovery periods.

Can I track my heart rate with Norwegian 4x4 Protocol?

Yes, you can connect your Apple Watch to the Norwegian 4x4 Protocol app to track your heart rate, heart rate zones, and calories burned during your workouts.

What are the subscription options for Norwegian 4x4 Protocol?

Norwegian 4x4 Protocol offers a Pro subscription at $8.99 per week with a 3-day free trial, or $24.99 per year. These plans likely unlock additional features or content beyond the free version.

How often is Norwegian 4x4 Protocol updated?

The app was last updated on March 7, 2026, to version 1.2.4. This indicates a relatively recent update, suggesting ongoing development and support for the application.

Is Norwegian 4x4 Protocol suitable for beginners?

Yes, the app makes it easy to get started with the Norwegian 4x4 protocol by handling the timing of intervals. However, it's always recommended to consult a healthcare provider before starting any new exercise program.