If there were a single metric that summed up your fitness and your life expectancy — it would be VO2max. Hardly any value is studied as intensively in sports and longevity research, and hardly any receives as little attention in recreational sport. That is changing right now: sports watches estimate VO2max at the wrist, and anyone who takes their endurance training seriously can't get around this number. In this article you'll learn what VO2max actually is, which values are normal, and what kind of training improves it in a targeted way.
What is VO2max?
VO2max is the maximum amount of oxygen your body can take in, transport and use in the muscles per minute under load. It is usually expressed relative to body weight, in milliliters per kilogram per minute (ml/kg/min).
Behind it lies a whole chain of systems: the lungs (oxygen uptake), the heart and blood (transport), the capillaries and mitochondria (utilization in the muscle). VO2max is thus a comprehensive report card for your cardiovascular system — and that's exactly what makes it so meaningful.
Why VO2max determines more than fitness
Large cohort studies with hundreds of thousands of participants show a remarkably clear picture: the higher the cardiorespiratory fitness, the lower the risk of death — with no apparent upper limit. In these analyses, the difference between a very poor and a very good VO2max has a stronger effect on life expectancy than classic risk factors such as smoking, diabetes or high blood pressure.
VO2max also declines from around age 30 by roughly 10 percent per decade — faster in untrained people. If you build a high base early and maintain it as you age, you spend your whole life above the threshold at which everyday activities become strenuous. That is exactly why longevity research regards VO2max as one of the most important modifiable health markers of all.
Which VO2max values are normal?
As a rough guide for relative VO2max (ml/kg/min):
- Untrained adults: women around 27 to 35, men around 35 to 43
- Regular endurance exercisers: around 45 to 55
- Ambitious amateurs: 55 to 65
- World-class endurance athletes: 70 to over 90
Values decline with age and differ between the sexes (partly due to differences in hemoglobin and body composition). More important than comparing yourself with others is your own development over months and years.
How is VO2max measured?
Gold standard: cardiopulmonary exercise testing
In cardiopulmonary exercise testing (spiroergometry), you run or cycle to exhaustion wearing a breathing mask while your respiratory gases are analyzed. Alongside VO2max, this performance diagnostic also delivers training zones and threshold values — the basis for precise training control.
Estimates from sports watches
Sports watches estimate VO2max from the relationship between pace and heart rate. The absolute values can be off by several points, but the trend over weeks is genuinely useful — as with sleep trackers, the rule is: trends yes, single readings with caution.
Field tests
The Cooper test (maximum distance in 12 minutes) provides a simple approximation: your VO2max can be estimated from the distance covered. For beginners without a lab, it's a good starting point.
Improving your VO2max: how to train right
In the training methodology of update Akademie, VO2max is developed through three components — Ausschöpfung, Potential and fatigue resistance. For getting started, the first two matter most:
1. The broad base: the Ausschöpfung component (base endurance)
The bulk of your endurance training belongs in the easy range at 65 to 75 percent of maximum heart rate: Zone 2 training builds up capillarization and increases the number of mitochondria. These adaptations take place in the muscle — they are the foundation that allows intense stimuli to work in the first place.
2. The sharp stimulus: Potential training close to VO2max
Once or twice a week, things are allowed to get intense. Short intervals at 90 to 95 percent of maximum heart rate have proven effective — for example, the classic 4×4 protocol: 4 minutes hard, 3 minutes easy, repeated four times. These stimuli act centrally on the heart and circulation and increase stroke volume. Where your thresholds lie and how to classify intensities is explained in our article on the anaerobic threshold.
3. The endurance anchor: fatigue resistance
Extensive intervals at 85 to 90 percent of maximum heart rate train the ability to hold a high intensity for a long time. Together with Potential training, they belong in that roughly 20 percent of your volume that does not sit in the base endurance range.
Realistic expectations
Untrained people can increase their VO2max by 15 to 25 percent within three to six months. The closer you get to your genetic potential, the smaller the jumps — which makes consistency, recovery and clean control via heart rate all the more important.
Course tip from update Akademie: Do you want to understand performance diagnostics, derive training zones and guide people toward greater endurance in a targeted way? That's exactly what you'll learn in the Athletikcoach programme at update Akademie — scientifically grounded, hands-on and part-time alongside your job.
Frequently asked questions about VO2max
How quickly can I improve my VO2max?
The first measurable improvements appear after six to eight weeks of structured training. Untrained people improve fastest; well-trained athletes work in small increments over years.
Is my sports watch's VO2max estimate accurate?
As a trend, yes; as an absolute value, only to a degree. Deviations of 5 to 10 percent are normal. If you want precise values and training zones, the path leads through cardiopulmonary exercise testing.
Can I also increase my VO2max with strength training?
Strength training barely improves VO2max directly, but it makes you more economical and more resilient — the combination of strength and endurance training is ideal. How to connect the two intelligently is shown in our article on hybrid training.
What VO2max do I need for good health?
Every point counts: even the step from "poor" to "below average" lowers the risk of death considerably. As a rule of thumb: if you can walk briskly for an hour, climb stairs without stopping and jog occasionally, you have a solid base — the Cooper test or performance diagnostics will make it measurable.
Conclusion
VO2max is more than a number for endurance athletes: it is one of the strongest modifiable markers for health and life expectancy. With a broad Zone 2 base, targeted intervals and a little patience, you can improve it at any age — and every point you gain pays off twice: in your performance today and in your independence tomorrow.
