# Norwegian 4x4 workout — Interval Training Timer

> Interval Training Timer (iPhone/iPad app by Alice Winthrop.)

- Source: https://appshunter.io/ios/app/norwegian-4x4-workout/id6762572409 (this page in markdown: same URL + `.md`)
- Developer: [Alice Winthrop](https://appshunter.io/developer/1894718905)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 33 MB
- Languages: American English
- Released: 2026-06-04
- Data updated: 2026-08-06
- User reviews in markdown: https://appshunter.io/ios/app/norwegian-4x4-workout/id6762572409/reviews.md

## What is Norwegian 4x4 workout?

Norwegian 4x4 is a focused interval training timer for the proven Norwegian 4x4 protocol — four 4-minute high-intensity intervals with 3-minute active recovery periods.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Norwegian 4x4 | $4.99 | one-time |



## Version history (last 5 releases)

### 1.4.0 — 2026-08-03

Your Norwegian 4×4 workouts now build a picture of your fitness over time.

WORKOUT HISTORY & DETAIL
Every workout is saved with full heart-rate detail. Tap any session to see your heart-rate curve with each phase shaded, a per-interval breakdown, and your time in the target zone.

FITNESS TRENDS
A new trends dashboard shows where you're heading — your heart-rate recovery after each interval and your average interval heart rate, each with a sparkline and a week-over-week trend — plus your weekly workout count and current streak.

POST-WORKOUT SUMMARY
See your duration, peak heart rate, and average heart-rate recovery the moment you finish.

MORE RELIABLE APPLE WATCH SYNC
Live heart rate stays current on your iPhone even with your wrist down, and starting a workout on one device keeps the other in sync.

YOUR DATA, YOUR CONTROL
All history is stored privately on your device. Delete any single workout, or clear your whole history, at any time.

### 1.3.3 — 2026-07-20

This update improves how your iPhone and Apple Watch stay in sync during a workout.

• Fixed an issue where opening the app on your iPhone after starting a workout on your Apple Watch could interrupt or end the workout — your iPhone now picks up the in-progress workout and stays in sync.
• Fixed a case where the app could briefly show a completed workout right after opening.
• General reliability improvements for watch-to-phone workouts.

### 1.3.2 — 2026-07-19

Fixed the Apple Watch warm-up timer so a workout started from your watch now begins at the full warm-up time. Reliability improvements to unlocking the app.

### 1.3.1 — 2026-07-15

Bug Fixes & Improvements

Fixed an issue where the Apple Watch would show a 3-2-1 countdown when the workout was started from the iPhone. The countdown now only appears for watch-initiated starts.

Heart rate display now indicates when readings are stale — if the watch connection stalls, the BPM dims and shows a status message ("Watch not reachable — open the watch app" or "Waiting for heart rate…") so you're never misled by a frozen number.

### 1.3.0 — 2026-07-13

Workout history is here.
See your past workouts — every Norwegian 4×4 you complete now appears in a new History screen, with duration, average and peak heart rate, and a phase-by-phase breakdown of your time in zone.
Your existing workouts, automatically — past 4×4 sessions you've saved to Apple Health are imported the first time you open this version, so your history is there from day one.
Manage your data — remove any workout from your history whenever you like. Everything stays on your device.
Watch reliability improvements — smoother, better-aligned timing between your iPhone and Apple Watch when you start a workout.

## Related topics

[norwegian 4x4](https://appshunter.io/ios/topics/norwegian-4x4)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-06.*