# Norwegian 4x4 HIIT - Myworkout — Improve VO2max & heart health

> Science-based cardio program to improve VO2 max and prevent lifestyle diseases. (iPhone/iPad app by Myworkout AS.)

- Source: https://appshunter.io/ios/app/norwegian-4x4-hiit-myworkout/id6497329690 (this page in markdown: same URL + `.md`)
- Developer: [Myworkout AS](https://appshunter.io/developer/1091561929)
- Category: Health & Fitness, Medical
- Price: Free with in-app purchases
- Rating: 4.70/5 from 15 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.4 · 150 MB
- Languages: American English, German (Germany), Norwegian Bokmål, Swedish
- Released: 2024-10-23
- Data updated: 2026-08-21
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/norwegian-4x4-hiit-myworkout/id6497329690/reviews.md

## What is Norwegian 4x4 HIIT?

Myworkout 4x4 is the cardio exercise solution for adults who want a time-efficient way to live in good health with freedom from lifestyle diseases. Brought to you by the creators of the Norwegian 4x4 method.

Just over 30 minutes of exercise, twice a week, is all it takes.

• Prevent common lifestyle diseases such as Diabetes, Parkinson's, and Arthritis to name a few.
• Based on established and peer-reviewed science.
• Measure and improve your VO2 max with accuracy far superior to current smartwatches and close to that of a calibrated lab test.
• Import workouts from Apple Health, Fitbit, Polar, and Garmin.

NOTES
Guided Norwegian 4x4 workouts are a Premium feature. A monthly recurring premium subscription is required for premium features and is available as an in-app purchase once you have registered an account. The subscription will automatically renew each month and will be charged through your app store account unless canceled at least 24 hours prior to the end of the current period. You can turn off auto-renew at any time from your app store account settings. Cancellation of the current active subscription period is not allowed. If you are eligible for a free trial period, payment will be charged to your app store account as soon as it has expired. If not, then it will be charged at confirmation of purchase. Find the full terms and conditions, and our privacy policy, at http://myworkout.com/terms-and-privacy/.

Patients with cardiovascular disease should consult a physician before engaging in high intensity interval training.
The app uses your phone's GPS to track your position during use. Continued usage of GPS running in the background can dramatically decrease battery life.
Myworkout 4x4 can be used to both export activities to and import activities from Apple Health.

## Key features

- Time-efficient cardio workouts
- VO2 max measurement and improvement
- Prevention of lifestyle diseases
- Integration with Apple Health, Fitbit, Polar, Garmin
- Science-based and peer-reviewed methodology
- GPS activity tracking

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly | $9.99 | per month |
| Premium yearly | $59.99 | per year |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/norwegian-4x4-hiit-myworkout/id6497329690/reviews.md

### 3/5 — Until..

*2026-05-21*

They wanted $10/mo for it.  Nice UI that includes live HR. But really all I need is the timer and hr with prompts per interval. The high intensity segments can only use one peanut butter power reading.  For real V02 calc I assume need to be able to input actual power ave per segment.  Even if not,
I want to record actuals as of course that likely varies.

**Developer response:** Thanks for the feedback. Just to clarify: the app does support entering the average power reading for each individual high-intensity interval. Tap the chevron to open each stage separately, and you can record a separate power value for each interval.

If your last comment refers to reading and storing values automatically from a power meter, that is not currently supported, but we appreciate the input and would like to understand that use case better. Feel free to reach out to our support so we can assist you better and understand your needs.

### 5/5 — Wonderful

*2025-08-07*

This works great for the Norwegian 4x4 protocol.  I can’t say enough good things about this app.  I just discovered their research paper on PubMed.  Awesome!

**Developer response:** Thank you for the great review. We’re glad to hear the app works well for your Norwegian 4x4 training, and we really appreciate that you took the time to look into the research behind the method. Thanks for using the app.

### 5/5 — Wonderful

*2025-07-31*

This works great for the Norwegian 4x4 protocol.

## Frequently asked questions about Norwegian 4x4 HIIT

### What is the Norwegian 4x4 HIIT method?

The Norwegian 4x4 HIIT method is a science-based cardio exercise program that involves short, intense workouts twice a week to improve VO2 max and overall health, aiming to prevent lifestyle diseases.

### How accurate is the VO2 max measurement?

The app measures and improves your VO2 max with accuracy far superior to current smartwatches and close to that of a calibrated lab test.

### Can I import my past workouts?

Yes, you can import workouts from Apple Health, Fitbit, Polar, and Garmin, allowing you to consolidate your fitness data within the app.

### What lifestyle diseases can this app help prevent?

The app aims to help prevent common lifestyle diseases such as Diabetes, Parkinson's, and Arthritis through regular, high-intensity cardio exercise.

### Is there a free trial for the premium subscription?

Yes, both the Premium Monthly and Premium Yearly subscription plans offer a 7-day free trial period before payment is charged.

### How do I cancel my subscription?

You can turn off auto-renew at any time from your app store account settings. Cancellation of the current active subscription period is not allowed.

### Does Norwegian 4x4 HIIT have ads?

No, the app does not contain advertisements. It operates on a freemium model where core features are free, and premium features require a subscription.

### What devices is Norwegian 4x4 HIIT available on?

The app is currently supported on iPhone and iPod devices, with a focus on providing a high-quality experience for these platforms.

## Version history (last 5 releases)

### 1.22.0 — 2026-08-05

- Add lifetime purchase option
- Improve connection to HRM devices during workouts and how we display this information in the workout details
- Improvements of workout timer UX

### 1.21.0 — 2026-05-25

Fixed an issue where the Streak Widget could appear blank instead of showing your progress.

### 1.20.0 — 2026-05-19

Updated onboarding experience

### 1.19.0 — 2026-05-05

- Refined evaluation screen for better clarity
- Fixed the disappearing pause button on endurance training workouts
- Eliminated a few pesky crashes behind the scenes

### 1.18.0 — 2026-04-27

- We've added Live Activity support for the Norwegian 4x4 interval workouts. Now, when you minimize the app or lock your phone, you can still follow the most important workout information directly from your display.
- We've also made general user experience improvements across the app to make workouts feel smoother and clearer.
- The Norwegian 4x4 interval timer is now included as part of the Premium plan.

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## More apps by Myworkout AS

- [Myworkout GO for Business](https://appshunter.io/ios/app/myworkout-go-for-business/id1091561930)

All apps by Myworkout AS: https://appshunter.io/developer/1091561929

## Related topics

[norwegian 4x4 protocol](https://appshunter.io/ios/topics/norwegian-4x4-protocol) · [vo2max hiit workout](https://appshunter.io/ios/topics/vo2max-hiit-workout) · [norwegian 4x4](https://appshunter.io/ios/topics/norwegian-4x4) · [4x4 hiit](https://appshunter.io/ios/topics/4x4-hiit) · [4medica 4health](https://appshunter.io/ios/topics/4medica-4health) · [4improve](https://appshunter.io/ios/topics/4improve) · [norwegian 4x4 heart rate](https://appshunter.io/ios/topics/norwegian-4x4-heart-rate) · [norwegian 4x4 workout](https://appshunter.io/ios/topics/norwegian-4x4-workout)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*