Is the Norwegian 4x4 good for beginners?

Yes, with two adjustments. Beginners should start at the lower end of the intensity, around 85 percent of maximum heart rate rather than 90 to 95, and can shorten the intervals or reduce the number of rounds at first. The structure itself, four hard efforts with easy recovery between them, is beginner-friendly because the recovery is built in. Untrained people also see the fastest VO2 max gains, so beginners get the most benefit.

How many times a week should a beginner do the Norwegian 4x4?

Twice a week, on non-consecutive days, is the right dose for a beginner. That is enough to drive VO2 max gains while leaving recovery time, since the adaptation comes from intensity, not volume. Add easy walking, cycling, or jogging on other days if you want more activity, but keep hard 4x4 sessions to two per week to start.

What if I cannot finish four intervals?

Do fewer. Start with two or three intervals and add one when the last one still feels manageable. You can also shorten each hard effort to two or three minutes at first and build up to the full four minutes. Finishing a scaled session you can repeat beats failing a full one, since consistency is what raises VO2 max.

How hard should the intervals feel for a beginner?

Hard but controlled, around 8 out of 10 effort, where you can say a few words but not hold a conversation. In heart rate terms that is roughly 85 to 90 percent of your maximum for a beginner, climbing toward 90 to 95 percent as you get fitter. You should feel like you could not keep the pace much past four minutes, but you are not sprinting to failure.

How long until a beginner sees results from the Norwegian 4x4?

Most beginners feel easier breathing and faster recovery within 2 to 3 weeks, and measurable VO2 max improvement appears around 6 to 8 weeks of twice-weekly sessions. Beginners improve fastest of anyone, often more than the roughly 7 percent seen in already-trained subjects, because there is more room to gain.

Norwegian 4x4 for Beginners: How to Start Safely

By Cristian Serb · Updated August 18, 2026

A runner pacing a hard interval on a road at golden hour

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Beginners can do the Norwegian 4x4 with two changes: start at the lower end of the intensity, around 85 percent of your maximum heart rate, and scale the volume down, using fewer or shorter intervals until you can complete all four. Do it twice a week on non-consecutive days. The recovery is built in, and beginners gain VO2 max the fastest, so it is one of the best first interval workouts.

The Norwegian 4x4 is the most studied VO2 max interval workout, and it works for beginners, not just trained athletes. The trick is to scale the intensity and volume to where you are now, then build up. Here is how to start without overdoing it. For the full method and the science, see the Norwegian 4x4 protocol.

What the Norwegian 4x4 Is, Briefly

The workout is four intervals of 4 minutes of hard effort, each followed by 3 minutes of easy active recovery, with a warm-up before and a cool-down after. At full intensity the hard efforts sit at 90 to 95 percent of maximum heart rate, and the method has repeatedly raised VO2 max by around 7 percent in eight weeks in trained subjects (Helgerud et al., 2007). Beginners gain more, because there is more room to improve.

Can Beginners Really Do It?

Yes. The structure is actually forgiving: every hard effort is followed by three full minutes of easy recovery, so you are never going hard for long without a break. What beginners need to adjust is not the shape of the workout but two dials: intensity and volume.

Intensity. Start your hard efforts at about 85 percent of maximum heart rate, or an 8 out of 10 effort, rather than the 90 to 95 percent trained athletes use. You should be working hard but in control.
Volume. If four full 4-minute intervals is too much at first, do fewer or shorter ones and build up, as in the plan below.

How Hard Should the Intervals Feel?

Aim for hard but controlled: you can get a few words out but not a sentence. If you are gasping and your pace is collapsing before the 4 minutes are up, ease off next time. If you finish an interval feeling you could have gone much longer, push a little harder. A heart rate monitor helps you stay honest, but the talk test works on its own.

How Often to Train

Twice a week, on non-consecutive days, for example Tuesday and Friday. That is enough to drive the adaptation while leaving recovery time; hard intervals need about 48 hours between sessions. On other days, easy walking, cycling, or jogging is fine and helps build the aerobic base that makes the hard sessions more productive.

A Gentle 4-Week Beginner On-Ramp

Build from shorter, fewer intervals to the full protocol over four weeks:

Week	Sessions	Intervals	Intensity
1	2	3 x 3 min hard, 3 min easy	~85% max HR
2	2	4 x 3 min hard, 3 min easy	~85-88% max HR
3	2	4 x 4 min hard, 3 min easy	~88-90% max HR
4	2	4 x 4 min hard, 3 min easy	~90% max HR

Always keep a 10-minute easy warm-up before and a 5-minute cool-down after. If a week feels too hard, repeat it before moving on. For a longer structured build, see the Norwegian 4x4 training plan.

Common Beginner Mistakes

Starting too hard. Going all-out on the first interval means you fade badly by the third. Start controlled and finish strong.
Doing it too often. Three or four hard sessions a week does not raise VO2 max faster; it raises injury and burnout risk. Two is the sweet spot.
Skipping the warm-up. Cold intervals feel worse and raise strain. Ten easy minutes first makes the hard efforts more productive.
Only ever running. You can do the 4x4 on a bike, rower, or uphill walk. The heart does not care about the mode, so pick what you can sustain.

Beginner Modifications

If running four hard minutes is not realistic yet, keep the 4-minute and 3-minute structure but change the mode or intensity: brisk incline walking, easy cycling with hard pushes, or a run-walk where you jog the hard interval and walk the recovery. The goal is four controlled hard efforts, however you reach them.

Run the Norwegian 4x4 in PEAKVO2

PEAKVO2 guides the 4x4 on iPhone and Apple Watch, with full-screen phases, spoken cues, a haptic tap at each switch, and heart rate zones, so you just follow along and hit the right effort. Scale it down and build up. Three workouts free.

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References

Helgerud J, Høydal K, Wang E, et al. Aerobic high-intensity intervals improve VO2max more than moderate training. Med Sci Sports Exerc. 2007;39(4):665-671. PubMed
Milanović Z, Sporiš G, Weston M. Effectiveness of High-Intensity Interval Training (HIT) and Continuous Endurance Training for VO2max Improvements: A Systematic Review and Meta-Analysis of Controlled Trials. Sports Med. 2015;45(10):1469-1481. PubMed

Cristian Serb

I'm the developer of PEAKVO2. I built it because I was doing the Norwegian 4x4 myself and wanted the timing handled on my wrist so I could just train. I took my own VO2 max from about 41 to 51 with it. PEAKVO2 on the App Store.