4x4 HIIT
4x4 HIIT is made and published by SIA Valabijs. AppBrain is an independent app data site and isn't affiliated with SIA Valabijs. The app name, icon, screenshots and description belong to SIA Valabijs and are shown as published on the App Store.
AppBrain's verdict
- Last updated
- March 1, 2026
Rankings
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Competitors
Similar apps and more from SIA ValabijsAlternatives to 4x4 HIIT
Releases
Updates seen on the App Store- Version
- 1.2
- Launched
- November 2025
No changelog data
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 2.38 MB
- Content rating
- High
Technologies used by 4x4 HIIT
About the app and developer
About 4x4 HIIT
4x4 HIIT is a health & fitness app developed by SIA Valabijs.
User Ratings
The app has no ratings yet.
App Information
4x4 HIIT is freely available from the App Store. The app size is 2.38 MB. The latest version available is 1.2. The last update was on March 1, 2026.
Technical Requirements
The app has a content rating of High Maturity. The app has been available on the App Store since November 2025.
Developer information for SIA Valabijs
Address:
Frequently asked questions about 4x4 HIIT
Is 4x4 HIIT free?
Yes. 4x4 HIIT is free on the App Store.
Is 4x4 HIIT still available?
Yes. 4x4 HIIT is on the App Store, and the last update we saw was on March 1, 2026.
How large is 4x4 HIIT?
4x4 HIIT is 2.38 MB.
Is 4x4 HIIT suitable for children?
App Store gives 4x4 HIIT a high maturity rating. It is meant for adults.
Who made 4x4 HIIT?
4x4 HIIT was developed by SIA Valabijs. It is listed in the health & fitness category on the App Store.
What are the best alternatives to 4x4 HIIT?
People looking at 4x4 HIIT also look at these health & fitness apps: Boost VO2 - Norwegian 4x4, HIIT 4x4 Lite, N4x4, VO2 Flow: Norwegian 4x4 Timer, Praktijk Fysio Zeeland.
Store listing
By SIA Valabijs, from the App Store
Description by SIA Valabijs Written by the developer, not by AppBrain. Click to read.
WHAT IS 4x4?
Four intervals of 4 minutes at high intensity (85-95% max heart rate), separated by 3 minutes of active recovery. That's it.
WHY IT WORKS
Developed by Norwegian exercise scientists, this protocol has been proven in clinical studies to:
- Increase VO2 max faster than traditional cardio
- Improve cardiovascular health
- Boost endurance and athletic performance
- Deliver maximum results in minimum time
SIMPLE TO USE
- Clear visual timer with audio cues
- Tracks your intervals automatically
- Works with any activity: running, cycling, rowing, or body weight exercises
- No complicated setup - just hit start
PERFECT FOR
- Runners looking to improve race times
- Athletes building aerobic capacity
- Anyone wanting efficient, science-backed cardio
- People with limited time for training
The Norwegian 4x4 protocol is one of the most researched and effective HIIT methods available. Stop guessing. Start training with proven science.
Download now and take the first step toward your best cardiovascular fitness.