Free Online Norwegian 4x4 Timer
Start the complete Norwegian 4x4 workout in your browser with the warmup, four hard intervals, 3-minute recoveries, and cooldown already set up. The native Ramp4x4 app adds live Apple Watch heart-rate coaching, haptics, voice cues, and workout summaries.
Published June 15, 2026Last updated July 24, 2026By Archline Labs LLCEditorial methodology
Free in your browser. No account, signup, or installation required.
What a Norwegian 4x4 timer runs
The structure never changes, which is exactly why it suits a dedicated timer. One session is:
- 10-minute warmup at an easy, conversational effort.
- Four 4-minute hard intervals at 85 to 95% of max heart rate.
- Three 3-minute active recoveries between the intervals, at 60 to 70%.
- A short cooldown of 3 to 5 minutes.
Warmup Hard interval (4 min) Recovery (3 min) Cooldown
See the 4x4 interval flow
Run a short, sped-up demo of the Norwegian 4x4 structure: warmup, four hard intervals, active recoveries, and cooldown. The demo uses simulated heart rate so you can see how Ramp4x4 guides each phase. In the app, your Apple Watch provides live heart-rate data, haptics, and workout cues.
That is the full Norwegian 4x4 shape. The real workout runs on your Apple Watch with live heart rate, haptics, and cues.
Explore the complete app previewHeart rate shown here is simulated for demonstration only. In the app, your real heart rate comes from Apple Watch.
Want the real version on your wrist?
Ramp4x4 runs the full Norwegian 4x4 workout on Apple Watch with live heart rate, strong haptics, clear phase changes, and post-workout summaries.
Why generic timers are annoying for 4x4s
You can run a 4x4 with a stopwatch, a treadmill timer, or a generic HIIT app. The friction is in the setup and the babysitting:
- You have to program nine phases by hand every time, or count them in your head.
- A generic countdown does not know your heart-rate target, so you are also doing zone math mid-warmup.
- During the hard minutes you end up staring at a screen to catch the next phase change, exactly when you least want to.
- Miss a beep and you drift past the interval or cut a recovery short.
Why a dedicated 4x4 timer helps
Because the Norwegian 4x4 has one fixed structure, a purpose-built timer can take all of that off your plate:
- One-tap setup of the warmup, four intervals, recoveries, and cooldown.
- Target heart-rate zones calculated for you, so the timer knows what "hard" means for your body.
- Phase changes you feel, not just see, so you are not glued to a screen.
- Live heart-rate feedback as a pacing guide through each interval.
- A clean summary afterward, plus history and VO2 max trends over your training block.
On Apple Watch: haptics and phase changes
Ramp4x4 is Apple Watch-first. The watch keeps the current phase, a big countdown, and your live heart-rate zone on your wrist, and it taps you with haptics at every phase change so you know to push or ease off without looking. That matters most during the hard intervals, when reading a screen is the last thing you want to do. There is a dedicated walkthrough on the Apple Watch Norwegian 4x4 timer page.
Live heart-rate target feedback
The timer is wired to your heart-rate zones, so it shows your live heart rate against the 85 to 95% target during work and the 60 to 70% range on recovery. Heart rate is a guide, not a pass-or-fail line: it lags at the start of each interval, as shown in our workout-by-workout heart-rate data. That is also why the timer stays fixed instead of pausing below target. You can set your zones first with the Norwegian 4x4 heart-rate calculator.
Your summary and share card
After the session, Ramp4x4 shows a clean recap with your Total time, Avg HR, Peak HR, Time above 90% max HR, and distance, plus a heart-rate curve over the whole workout. The shareable card uses the same numbers, so the recap you see in the app is the one you can post.
What Ramp4x4 looks like
Ramp4x4: your guided Norwegian 4x4 timer
Ramp4x4 is a guided Norwegian 4x4 timer for iPhone and Apple Watch. It calculates target zones, cues every phase, shows live heart-rate feedback, and tracks your progress so you can focus on the workout instead of managing a stopwatch.
Keep going
Timer FAQ
What is the best Norwegian 4x4 timer?
Any interval timer set to 10 minutes, then 4 minutes hard and 3 minutes easy four times, then a cooldown will run the structure. Ramp4x4 for iPhone and Apple Watch is purpose-built for the Norwegian 4x4 and adds calculated target zones, phase cues, haptics, and live heart-rate feedback so you can focus on the effort.
Can I use a generic interval timer for the 4x4?
Yes, but you have to build the nine phases yourself and then watch the clock and your heart rate at the same time while working hard. A dedicated 4x4 timer sets up the whole session in one tap and cues every phase so you do not have to manage it.
Does the Norwegian 4x4 timer work on Apple Watch?
Yes. Ramp4x4 is Apple Watch-first. The watch shows the current phase, a large countdown, and your live heart rate against the target zone, with haptics and voice cues at every phase change. Workouts save to Apple Health.