4x4 HIIT
Norwegian 4x4 HIIT Trainer
Free
Transform your cardiovascular fitness with the Norwegian 4x4 HIIT protocol - the scientifically-backed method used by elite athletes and researchers to dramatically improve VO2 max and heart health.
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.
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We've made some app improvements and bug fixes.
The developer, SIA Valabijs, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
Accessibility
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Information
- Seller
- Valabijs SIA
- Size
- 2.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © Valabijs SIA