Question 1

What is the Norwegian fitness age?

Accepted Answer

Developed by NTNU researchers from the HUNT study, fitness age estimates your VO2max-based cardiovascular age from resting heart rate, waist size, exercise habits, and demographics — without requiring lab tests.

Question 2

What is VO2max?

Accepted Answer

VO2max is the maximum volume of oxygen your body can use during intense exercise (ml/kg/min). It is the gold-standard measure of aerobic fitness and is strongly linked to longevity.

Question 3

How accurate is this calculator?

Accepted Answer

The NTNU equation explains roughly 60% of measured VO2max variance — meaningful for population estimates but not a substitute for a lab CPET test.

Question 4

How can I lower my fitness age?

Accepted Answer

Add 2–3 high-intensity interval sessions per week, reduce waist circumference, improve sleep, and stay consistent. Most adults can drop 5–10 fitness years within 12 weeks.

Question 5

Why does waist circumference matter?

Accepted Answer

Abdominal fat is strongly inversely correlated with VO2max and cardiovascular health, independent of total body weight.

Fitness Age Calculator (Norwegian / NTNU)

How to Use This Calculator

Frequently Asked Questions

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