Norwegian 4x4 Protocol: Boreas

Name: Norwegian 4x4 Protocol: Boreas
Rating: 4.7 (35 reviews)
Author: Havard Tryman

Interval training for VO2 max

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

35 Ratings
Ages

9+
Years
Category

Sports
Developer

Havard Tryman
Language

EN
English
Size

9
MB

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. Terms of use for Norwegian 4x4 Protocol: Boreas: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

4.7

out of 5

35 Ratings

Good Workout Companion
Jan 14

4x4 Workout
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.
Good Workout Companion
Jan 14

4x4 Workout

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.
It finally works!
Feb 25

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

Developer Response
Thanks for the review!
It finally works!
Feb 25

ChicagolandJim

Just redownloaded the app and it now gets heart rate info and the workout automatically began on my watch. Impressive.
Developer Response Feb 28
Thanks for the review!
No heart guidance??
Jan 8

Sean1091
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.

Developer Response
Thank you for the feedback. The app has now been updated to display heart rate and heart rate zone in real-time on Apple Watch. There can be a slight delay in heart rate data due to how Apple's HealthKit delivers updates, but it should usually be minimal. Real-time voice coaching for heart rate zones is a great suggestion to keep in mind for future updates. Regarding trying features before buying: there is a free trial that lets you try all features before committing.
No heart guidance??
Jan 8

Sean1091

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.
Developer Response Feb 3
Thank you for the feedback. The app has now been updated to display heart rate and heart rate zone in real-time on Apple Watch. There can be a slight delay in heart rate data due to how Apple's HealthKit delivers updates, but it should usually be minimal. Real-time voice coaching for heart rate zones is a great suggestion to keep in mind for future updates. Regarding trying features before buying: there is a free trial that lets you try all features before committing.

This version of Norwegian 4x4 Protocol: Boreas includes improvements and bug fixes

Version 1.2.5 1d ago

Data Linked to You

The following data may be collected and linked to your identity:
- Identifiers
Data Not Linked to You

The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

Information

Seller: Havard Tryman
Size: 9 MB
Category: Sports
Compatibility: Requires iOS 16.6 or later.

iPhone
Requires iOS 16.6 or later.

iPad
Requires iPadOS 16.6 or later.

Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 1.0 or later.

Apple Watch
Requires watchOS 9.6 or later.
Languages: English
Age Rating: 9+

9+

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Contains
Health or Wellness Topics
In-App Purchases: Yes

Pro $8.99

Pro $24.99

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