Norwegian 4x4 Walking Workout: Incline Treadmill & Hills
You can do Norwegian 4x4 intervals by walking briskly uphill if it produces a hard effort you can repeat. Keep the same four 4-minute work periods and three 3-minute active recoveries. The walking speed and incline depend on you, not a universal treadmill setting. NTNU's walking and running instructions explicitly include this option.
Published October 28, 2026 · Last updated October 28, 2026 · By Archline Labs LLC · Editorial methodology
The Norwegian 4x4 walking session
Walking changes how you produce the effort. It does not change the work and recovery clock. This version uses a 10-minute warmup and 5-minute cooldown, making a 40-minute session.
| Phase | Time | What to do |
|---|---|---|
| Warmup | 10 minutes | Walk comfortably, then gradually introduce some incline. |
| Work | 4 minutes, four times | Walk uphill at a hard, controlled effort. The usual protocol target is 85 to 95% of maximum heart rate. |
| Recovery | 3 minutes between work periods, three times | Reduce the effort and keep walking easily. The usual recovery guide is 60 to 70% of maximum heart rate. |
| Cooldown | 5 minutes | Return to comfortable walking after the fourth work period. |
The work should feel strenuous and make conversation difficult, without turning into an all-out sprint. Heart rate takes time to respond: do not abruptly increase the treadmill setting to force a number in the first few seconds. See the recorded heart-rate ramp analysis for the distinction between interval duration and time in target.
Find your treadmill speed and incline
There is no single mph, km/h or grade that makes a walking workout a Norwegian 4x4. Start from a walking pace you can control, then use the incline to find a repeatable effort. If you need the rails to sustain the setting, reduce it. Follow the treadmill's safety instructions and change settings only when you can do so safely.
| What you notice | What to consider |
|---|---|
| The full interval feels easy | After checking that the target and sensor make sense, try a modest increase in incline on the next effort. |
| You cannot finish four minutes with control | Reduce incline or speed. A setting that forces an early stop is not a useful starting point. |
| The effort is hard but heart rate is still rising | Hold a controlled effort and watch the trend. A delayed reading is not an instruction to surge. |
| Balance or walking form deteriorates | Reduce the setting. Choose a different activity if the required walking effort is not comfortable to manage. |
For some fitter people, walking will not produce the intended intensity at a manageable grade. Running, cycling or rowing may be a better fit. Walking is an option, not a promise that every treadmill setting will suit every person.
The treadmill guide and speed converter handle mph, km/h and pace. A pace conversion does not predict the heart rate an incline will produce.
Worked example: turn your maximum into BPM
For an illustrative maximum heart rate of 200 BPM, 85 to 95% is 170 to 190 BPM, and 60 to 70% is 120 to 140 BPM. These are arithmetic examples, not your prescribed targets. Use the free heart-rate calculator with your own measured maximum or an age-based estimate, then consider how the effort feels. A formula can be wrong for an individual.
Recovery starts when the work period ends. Ease off promptly; you do not have to see the lower recovery number immediately. Do not add extra hard minutes while waiting for your heart rate to cross a threshold.
How to do the walking intervals outdoors
- Choose the route before starting. Look for a predictable, non-technical incline with room for a four-minute effort and an easy recovery route. Avoid traffic crossings and surfaces that demand constant footing decisions.
- Keep the timer visible or audible. A landmark is useful for orientation, but the end of the hill should not silently change a four-minute effort into a shorter or longer one.
- Plan the recovery separately. Walk gently on a suitable section. Do not rush downhill just to get back to the same starting point within three minutes. If the route does not work, choose another hill or use a treadmill.
- Record conditions alongside the session. Route, grade and weather help explain why the same walking pace can feel different on another day.
Use the free 4x4 timer to check the sequence before you head out. The browser timer does not measure your heart rate.
Build up before adding another hard day
If four full efforts are too much, use the adaptable eight-week progression rather than forcing the full workout. Shortened efforts are preparation for the standard protocol. Once sessions are repeatable, use the weekly frequency guide to think about where a hard day belongs among easy activity and rest.
Keep a simple log of walking speed, incline or route, effort and how you feel afterward. Changing all of these at once makes it difficult to learn which setting actually helped.
Walking 4x4 questions
Does walking count if I am not running?
Yes. The relevant distinction is the effort you can sustain, not whether both feet leave the ground. NTNU includes uphill walking in its instructions. A gentle walk that stays easy is a different session.
What incline should I use?
There is no universal grade. Choose a manageable walking pace, adjust incline gradually, and judge the full four-minute effort. Avoid a setting that makes you hang on to the rails or lose control.
Can I keep the same speed during recovery?
Only if lowering the incline makes the effort genuinely easy. Change speed as well when needed. Recovery is an easier phase, not simply a different number on the display.
Sources and limits
- NTNU CERG: walking and running 4x4 instructions.
- NTNU CERG: progressive exercise program.
- Helgerud et al., 2007: the interval-training study. A study protocol does not establish one ideal walking speed for everyone.
The adjustment table and route checklist are editorial examples, not a tested walking prescription. Archline Labs makes Ramp4x4 and is independent of NTNU and the researchers cited.
Follow the workout with Ramp4x4
Preview the guided session, or use Ramp4x4 on iPhone and Apple Watch for phase cues and live heart-rate feedback. The browser preview uses simulated data.