If you’re looking for a workout that delivers results in minimal time, the Norwegian 4×4 method could be for you. Developed by the Cardiac Exercise Research Group at the Norwegian University of Science and Technology, this high-intensity interval training (HIIT) technique is designed to improve cardiovascular fitness.
The 4×4 workout consists of four minutes of intense exercise followed by three minutes of recovery, repeated four times. Total workout time is around 40 minutes, including warm-up and cool-down.
Master Trainer Andy Carr from Snap Fitness UK explains that the method can be applied to running, cycling, swimming, rowing, or gym cardio. The high-intensity intervals should reach 85-95% of your maximum heart rate, calculated by subtracting your age from 220.
A typical session includes:
- Warm-up: 5–10 minutes of light cardio
- Intervals: 4 minutes at 85–95% max heart rate
- Active Recovery: 3 minutes at 60–70% max heart rate
- Repeat: Four rounds
- Cool-down: 5–10 minutes of slow walking and stretching
The workout is proven to boost VO2 Max, a key measure of how efficiently your body uses oxygen. Higher VO2 Max improves performance and is linked to better long-term health.
Carr recommends doing the 4×4 twice a week for maximum benefits, but even once a week can yield noticeable improvements. He warns against overtraining, emphasizing that recovery is essential to avoid injury.
With its short duration and measurable results, the Norwegian 4×4 is an efficient choice for anyone seeking a time-effective, calorie-burning, and heart-healthy workout.
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