What is the Norwegian 4×4 Workout?
High-intensity interval training (HIIT) is an effective way to improve VO2 max. It involves alternating short bursts of vigorous cardiovascular exercise with brief periods of rest or active recovery.
One particularly effective approach is the Norwegian 4×4 protocol, which uses four 4-minute high-intensity intervals separated by 3-minute periods of active recovery.
During each work interval, you’ll aim for approximately 85-95% of your maximum heart rate. The result is a challenging workout designed to improve aerobic capacity and cardiovascular fitness.
Because of its intensity, the Norwegian 4×4 is best suited for people with some exercise experience who are comfortable working at a high intensity. Beginners can start with shorter or lower-intensity intervals and gradually build up.
What is VO2 Max?
VO2 max measures how efficiently your body takes in, transports, and uses oxygen during exercise. It is one of the most widely used measures of cardiorespiratory fitness.
A higher VO2 max is generally associated with better cardiovascular fitness and the ability to sustain exercise at higher intensities before fatigue sets in. Conversely, low cardiorespiratory fitness is strongly associated with a higher risk of all-cause mortality.
The good news? VO2 max isn’t fixed. Regular, targeted exercise can improve your aerobic fitness and increase your VO2 max over time.
How To Do the Norwegian 4×4 Workout
Starting a new exercise protocol can raise a few questions: Am I working hard enough? Am I going too fast?
During the 4-minute work intervals, the effort should feel challenging but controlled. You should be breathing heavily and have difficulty carrying on a conversation, but you should still be able to maintain your pace for the entire interval. If you cannot complete the full 4 minutes, you likely started at too high an intensity.
A heart rate monitor can help you gauge your effort and stay within the target range. Fitness watches such as an Apple Watch or Garmin can track your heart rate throughout the workout and determine whether you’re working at approximately 85-95% of your maximal heart rate.
Here’s a simple breakdown of the Norwegian 4×4 protocol:
Phase | Duration | Intensity |
Warm-up | 8-10 min | Easy → moderate |
Interval 1 | 4 min | 85-95% HRmax |
Active Recovery | 3 min | Easy |
Interval 2 | 4 min | 85-95% HRmax |
Active Recovery | 3 min | Easy |
Interval 3 | 4 min | 85-95% HRmax |
Active Recovery | 3 min | Easy |
Interval 4 | 4 min | 85-95% HRmax |
Cool-down | 5-10 min | Easy |
Common Mistakes:
1. Going too hard during recovery
- Recovery should be easy enough to lower your heart rate and prepare you for the next interval. Keeping the recovery controlled helps you maintain the quality of each work interval.
2. Skipping the warm-up
- Jumping straight into high-intensity exercise can place unnecessary stress on your muscles and cardiovascular system. A proper warm-up gradually raises your heart rate and prepares your body for harder efforts.
3. Starting the first interval too hard
- Going too fast can leave you fatigued before the workout is over. Start at a pace you can maintain across all intervals rather than making the first one your fastest.
4. Doing HIIT too frequently
- HIIT is demanding and requires adequate recovery. Training too frequently can lead to excessive fatigue and reduce the quality of your workouts.
5. Not tracking your heart rate
- Heart rate provides a useful measure of exercise intensity, particularly when fatigue makes it harder to judge effort. Tracking your heart rate over time can also help you monitor changes in fitness and recovery.
Benefits Beyond VO2 Max
The potential benefits of interval training extend beyond VO2 max. Research suggests HIIT can improve several markers of cardiovascular and metabolic health, including blood pressure, insulin sensitivity, resting heart rate, and body composition.
Putting it All Together
The Norwegian 4×4 is simple but isn’t easy. The key is to focus on controlled intensity, consistent pacing, and adequate recovery. You don’t need to sprint through every interval — the goal is to find an effort you can sustain across all four.
With regular training and appropriate progression, this can be an effective tool for improving aerobic fitness and VO2 max.
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