---
title: "Norwegian 4x4 Protocol - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Norwegian 4x4 HIIT Timer — Interval Training & VO2 Max  BOOST VO2 MAX WITH NORWEGIAN 4X4 PROTOCOL WORKOUTS  Train smarter with the Norwegian 4x4 protocol, one of the most studied HIIT methods for impr"
---

# Norwegian 4x4 Protocol — United States
> BEST VO2 & HR MAX TRAINING APP

![Norwegian 4x4 Protocol App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ea/92/55/ea92556d-408b-0f53-9f04-b42f5830c045/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/434x0w.png)

**Developer:** [Nikita Yampolski](https://apptail.io/developer/nikita-yampolski-oSab)
**Category:** Health Fitness
**Rating:** 4.3/5 (54 ratings)
**Price:** $5.99
**Bundle ID:** com.norwegian4x4.mobileapp
**Store:** Apple App Store
**Country:** United States
**Version:** 2.5 (released 2026-06-10)
**Original Release:** 2024-05-01
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6499464775)
**AppTail Page:** [https://apptail.io/app/norwegian-4x4-protocol-Tggq/united-states](https://apptail.io/app/norwegian-4x4-protocol-Tggq/united-states)

## Norwegian 4x4 Protocol Description
Norwegian 4x4 HIIT Timer — Interval Training & VO2 Max

BOOST VO2 MAX WITH NORWEGIAN 4X4 PROTOCOL WORKOUTS

Train smarter with the Norwegian 4x4 protocol, one of the most studied HIIT methods for improving cardiovascular performance and endurance. A precise, distraction-free timer guides every interval so you can focus on the effort.

KEY FEATURES:

- Norwegian 4x4 Timer - Precision 4min work / 3min rest cycles
- Heart Rate Training - Track 90-95% max HR zones
- VO2 Max Improvement - Scientifically proven results
- HIIT Interval Timer - Multiple workout protocols
- Progress Tracking - Monitor your fitness transformation
- Universal Training - Running, cycling, rowing, any cardio, you name it
- Offline Ready - No internet required during workouts
- Haptics Feedback and Vibrations
- Countdown before the start
- Customizable Warmup session length
- Customizable Cooldown session length

WHAT IS NORWEGIAN 4 BY 4 TRAINING?

The Norwegian 4x4 protocol is a revolutionary HIIT method featuring:

- 4 intervals of 4 minutes at 90-95% max heart rate
- 3 minutes active recovery between intervals
- Proven results: Increase VO2 max by up to 10% in 8 weeks
- Elite approved: Used by professional athletes worldwide

WHY CHOOSE NORWEGIAN 4X4 INTERVAL TRAINING?

- PROVEN RESULTS: Sports science research shows significant cardiovascular improvements
- BEGINNER FRIENDLY: Complete guide for Norwegian 4x4 workout beginners
- CUSTOMIZABLE: Adapt the Norwegian 4 x 4 protocol to your fitness level
- COMPREHENSIVE: Includes warm-up, cool-down, and recovery protocols
- VALIDATED: Mention in Tim Ferriss' Blog

PERFECT FOR:

- Athletes seeking performance gains with Norwegian 4x4 workouts
- Fitness enthusiasts wanting efficient HIIT interval training
- Anyone improving cardiovascular health through proven protocols
- Runners, cyclists, rowers using Norwegian 4x4 interval training

HOW OFTEN NORWEGIAN 4X4?

- Our app includes guidance on optimal training frequency and recovery for maximum VO2 max gains.

START YOUR NORWEGIAN 4X4 TRANSFORMATION

Join thousands who have revolutionised their fitness with the Norwegian 4x4 protocol training. Download the ultimate Norwegian 4x4 workout app now!

Download today and start training with the Norwegian 4x4.

## Norwegian 4x4 Protocol Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/fa/b3/af/fab3afc8-46e1-a65e-637b-c2f8ce831b14/f0f81855-58bb-49da-97b8-6457bd95d293_5.5-1.jpg/1242x2208.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/51/c4/3d/51c43dd9-07a8-d063-f79b-a26aec61ec0d/ca175c82-1a22-4319-9af8-d52635aace91_5.5-2.jpg/1242x2208.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c4/79/59/c479599a-7088-f587-0b83-531112634300/54fff067-c9f1-4e73-8f0a-3321f1b7c14a_5.5-3.jpg/1242x2208.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f7/c3/c8/f7c3c8c0-278b-48ee-4baf-6e8719268e45/7bff01a4-794d-4521-9da7-ffef6163610a_5.5-4.jpg/1242x2208.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/ee/9e/48/ee9e485d-f636-3683-3410-4c3acb5ac60b/6de24f8b-f4ed-4789-9a95-abf21ffc4843_5.5-5.jpg/1242x2208.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c1/23/f9/c123f967-166a-e5f3-507d-e7e55920d429/78db4676-0782-4523-894a-5157643d5a4b_5.5-6.jpg/1242x2208.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/41/02/c8/4102c848-1cfb-fddc-1c33-3d2c782d95a0/544a4da2-1fd2-4dc7-acb2-3e2487d44355_5.5-7.jpg/1242x2208.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/31/1d/9b/311d9b62-657f-e081-fd88-4351c176b9af/6c1d9b46-3d82-42fa-956a-f5ea7742997b_5.5-8.jpg/1242x2208.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/06/b5/23/06b52380-1fe4-7b49-9895-ce80b94d8218/39b91a8f-ae40-438b-86c7-799e492587f2_5.5-9.jpg/1242x2208.png)

## Norwegian 4x4 Protocol Rating Breakdown in United States
- 5 stars: 40 (74%)
- 4 stars: 3 (6%)
- 3 stars: 3 (6%)
- 2 stars: 4 (7%)
- 1 stars: 4 (7%)

## Norwegian 4x4 Protocol Reviews in United States

### *---- "No Details"
This app is essentially a timer, there is no guided instruction, which is difficult as a beginner. Also, when the app went in the background, it closed and kept starting over again during my workout. Do not recommend.
-- ErnLantry, 2026-03-15

### **--- "Meh"
I see why a trial period was not an option, I wouldn’t have purchased. I was expecting a linkage to target heart rates and the Apple Watch pulse reading.
-- thpitt, 2026-03-02

### **--- "User"
It has the right times, but no tracking history and goes out when have to use your electronic for  either a phone call or email etc
-- lacypoo, 2025-12-19

### ***** "Simplify 4 x 4"
This app handles the timing for 4 x 4 intervals. It is quite simple and works effectively. I have sometimes in the past lost track of which interval I was on this app solves the problem.
-- Michael Dodson, 2025-11-02

### **--- "Please don’t bill me again for this"
I am not using this app any more. Instead I found a HIIT routine that is a far more effective calorie burner. Also I hate being chained to a timer.
-- NikonJunkieGirl, 2025-10-12

### ***-- "Ok"
HR doesn’t fully sync.
-- Bellinghamster, 2025-08-25

### *---- "Doesn’t work"
Was excited to use this app but quickly became disappointed when I learned the heart rate doesn’t not sync with app when using Apple Watch.  It remains frozen on the reading for heart rate, which defeats the purpose for this app.  Supports response is they don’t control 3rd party apps.
-- WJ1224, 2025-08-22

### ***** "Jimmy Maher"
Love it ! Big help in getting me back to a state of fitness after years of neglecting my wellness
-- FinglasJimmy, 2025-07-23

### ***-- "So-so"
To make this work you have to keep you screen on and with that app open-fully.
-- Just ok!!!!!!, 2025-05-25

[View all Norwegian 4x4 Protocol reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)




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## Norwegian 4x4 Protocol Available In
- [United States](https://apptail.io/app/norwegian-4x4-protocol-Tggq/united-states)
- [Switzerland](https://apptail.io/app/norwegian-4x4-protocol-Tggq/switzerland)
- [Chile](https://apptail.io/app/norwegian-4x4-protocol-Tggq/chile)
- [India](https://apptail.io/app/norwegian-4x4-protocol-Tggq/india)
- [Kazakhstan](https://apptail.io/app/norwegian-4x4-protocol-Tggq/kazakhstan)
- [Germany](https://apptail.io/app/norwegian-4x4-protocol-Tggq/germany)
- [Bahrain](https://apptail.io/app/norwegian-4x4-protocol-Tggq/bahrain)
- [Bermuda](https://apptail.io/app/norwegian-4x4-protocol-Tggq/bermuda)
- [Brunei](https://apptail.io/app/norwegian-4x4-protocol-Tggq/brunei)
- [Brazil](https://apptail.io/app/norwegian-4x4-protocol-Tggq/brazil)
- [Belarus](https://apptail.io/app/norwegian-4x4-protocol-Tggq/belarus)
- [China](https://apptail.io/app/norwegian-4x4-protocol-Tggq/china)
- [Colombia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/colombia)
- [Cyprus](https://apptail.io/app/norwegian-4x4-protocol-Tggq/cyprus)
- [Czechia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/czechia)
- [Dominican Republic](https://apptail.io/app/norwegian-4x4-protocol-Tggq/dominican-republic)
- [Algeria](https://apptail.io/app/norwegian-4x4-protocol-Tggq/algeria)
- [Ecuador](https://apptail.io/app/norwegian-4x4-protocol-Tggq/ecuador)
- [Egypt](https://apptail.io/app/norwegian-4x4-protocol-Tggq/egypt)
- [Ghana](https://apptail.io/app/norwegian-4x4-protocol-Tggq/ghana)
- [Iceland](https://apptail.io/app/norwegian-4x4-protocol-Tggq/iceland)
- [Italy](https://apptail.io/app/norwegian-4x4-protocol-Tggq/italy)
- [Kenya](https://apptail.io/app/norwegian-4x4-protocol-Tggq/kenya)
- [Kuwait](https://apptail.io/app/norwegian-4x4-protocol-Tggq/kuwait)
- [Sri Lanka](https://apptail.io/app/norwegian-4x4-protocol-Tggq/sri-lanka)
- [Luxembourg](https://apptail.io/app/norwegian-4x4-protocol-Tggq/luxembourg)
- [Madagascar](https://apptail.io/app/norwegian-4x4-protocol-Tggq/madagascar)
- [Macao SAR China](https://apptail.io/app/norwegian-4x4-protocol-Tggq/macau)
- [Malta](https://apptail.io/app/norwegian-4x4-protocol-Tggq/malta)
- [Namibia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/namibia)
- [Panama](https://apptail.io/app/norwegian-4x4-protocol-Tggq/panama)
- [Peru](https://apptail.io/app/norwegian-4x4-protocol-Tggq/peru)
- [Paraguay](https://apptail.io/app/norwegian-4x4-protocol-Tggq/paraguay)
- [Qatar](https://apptail.io/app/norwegian-4x4-protocol-Tggq/qatar)
- [Russia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/russia)
- [Saudi Arabia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/saudi-arabia)
- [Senegal](https://apptail.io/app/norwegian-4x4-protocol-Tggq/senegal)
- [Tunisia](https://apptail.io/app/norwegian-4x4-protocol-Tggq/tunisia)
- [Uruguay](https://apptail.io/app/norwegian-4x4-protocol-Tggq/uruguay)
- [Angola](https://apptail.io/app/norwegian-4x4-protocol-Tggq/angola)
- [Uzbekistan](https://apptail.io/app/norwegian-4x4-protocol-Tggq/uzbekistan)
- [Austria](https://apptail.io/app/norwegian-4x4-protocol-Tggq/austria)
- [Azerbaijan](https://apptail.io/app/norwegian-4x4-protocol-Tggq/azerbaijan)
- [Barbados](https://apptail.io/app/norwegian-4x4-protocol-Tggq/barbados)
- [Belgium](https://apptail.io/app/norwegian-4x4-protocol-Tggq/belgium)
- [Bulgaria](https://apptail.io/app/norwegian-4x4-protocol-Tggq/bulgaria)

---

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