---
title: "Norwegian 4x4 Protocol: Boreas — App Overview"
url: https://marlvel.ai/intel-report/sports/norwegian-4x4-protocol-boreas
category: Sports
developer: Havard Tryman
platforms: ios
rating: 4.7 (35 ratings)
pricing: free
report_level: overview
generated: 2026-05-08
last_verified: "2026-05-08T09:36:18.376Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a focused, no-sign-in utility that streamlines the specific Norwegian 4x4 interval training protocol with wearable integration.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Sports |
| Rating | 4.7 ★ (35) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 1.3.0 |
| Developer | Havard Tryman |

<!-- SECTION: Summary -->
## What is Norwegian 4x4 Protocol: Boreas?

Norwegian 4x4 Protocol: Boreas is a specialized HIIT interval timer designed to guide users through the Norwegian 4x4 training method. The app integrates with Apple Watch for real-time heart rate and calorie tracking while syncing workout data directly to the Apple Health app.

<!-- SECTION: Key Features -->
## Key Features

- **Norwegian 4x4 Protocol Guidance**: Provides structured interval training sessions with customizable warm-up and cooldown durations.
- **Apple Watch Integration**: Displays real-time heart rate, heart rate zones, and calorie expenditure during workouts.
- **Voice Guidance**: Delivers audio cues for interval transitions, allowing users to track progress while the app runs in the background.
- **Health App Sync**: Automatically saves completed workout data to the Apple Health app for long-term tracking.

<!-- SECTION: Target Audience -->
## Who is it for?

Athletes and fitness enthusiasts focused on improving VO2 max, cardiovascular health, or training for endurance events like marathons.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/norwegian-4x4-protocol-boreas/id6751464534?uo=4)
- [Full Intelligence Report](https://marlvel.ai/intel-report/sports/norwegian-4x4-protocol-boreas)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/sports/norwegian-4x4-protocol-boreas).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*