Norwegian 4×4 vs. Tabata.
Both are HIIT, but they're built for different jobs. The Norwegian 4×4 chases VO₂max; Tabata chases anaerobic capacity. Here's the side-by-side and how to choose.
Side by side
| Norwegian 4×4 | Tabata | |
|---|---|---|
| Work interval | 4 minutes | 20 seconds |
| Recovery | 3 minutes easy | 10 seconds |
| Rounds | 4 | 8 |
| Total session | ~35–40 min | ~4 min (+ warm-up) |
| Intensity | 85–95% max HR | All-out (supramaximal) |
| Best for | VO₂max, aerobic ceiling | Anaerobic capacity, time-crunch |
Which should you do?
- Want to raise VO₂max / endurance? The 4×4. Its long intervals maximize time near your aerobic ceiling, which is what drives the adaptation.
- Short on time, after a quick hit?Tabata packs a strong stimulus into four minutes — good in a pinch, but it's not the most effective route to VO₂max.
- Building anaerobic punch (sprints, finishes)? Tabata's all-out bursts target exactly that.
One practical edge of the 4×4: because every interval is a long, steady effort, you can hold it to a precise heart-rate threshold and make sessions truly comparable. Tabata's 20-second bursts never reach a heart-rate steady state, so heart-rate gating doesn't apply the same way.
Frequently asked questions
- What's the difference between the Norwegian 4×4 and Tabata?
The 4×4 is four 4-minute intervals at 85–95% of max heart rate with 3-minute recoveries — built to maximize time near VO₂max. Tabata is eight 20-second all-out efforts with 10-second rests, about four minutes total — built to tax anaerobic capacity. Different durations, intensities, and goals.
- Which is better for VO₂max, 4×4 or Tabata?
The Norwegian 4×4 has the stronger evidence base for raising VO₂max. Its long intervals let you accumulate several minutes at or near your aerobic ceiling per rep, which is the main driver of VO₂max gains. Tabata improves fitness too but targets anaerobic capacity more than maximal aerobic power.
- Is Tabata or 4×4 harder?
They're hard in different ways. Tabata is short but brutally intense and very uncomfortable in the moment; the 4×4 is a longer, more sustained suffering. Most people find holding four full minutes above 85% mentally tougher than 20-second bursts.
- Can I do both?
Yes. A common split is the 4×4 (or other long VO₂max intervals) once or twice a week for aerobic power, with occasional short, sharp work like Tabata for variety or anaerobic capacity — all on a base of easy aerobic training.
Train at VO₂max.
If VO₂max is the goal, the 4×4 is the tool — and Stellar Intervals runs it the way it was studied.