What is VO₂max and how to improve it

26 June 2026 · Science · 5 min read

If you wear a sports watch, you've surely seen the "VO₂max" reading. It's one of the most well-known fitness indicators — but what does it actually mean?

What is VO₂max

VO₂max is the maximum amount of oxygen your body can use in one minute of intense exercise. In simple terms, it shows how big the "engine" of your endurance is. The higher your VO₂max, the greater your body's ability to deliver and use oxygen during exercise — so you can run harder for longer.

LungsTake in oxygen from the air

HeartPumps it around with the blood

BloodCarries the oxygen to the muscles

Muscles"Burn" the oxygen for energy

Running performanceFaster • stronger • more endurance

VO₂max = how efficiently this whole chain works.

What it depends on

Mainly three things: how much blood your heart sends with each beat, how efficiently your blood carries oxygen, and how well your muscles use it. Genetics play a role too — but the good news is that VO₂max improves with training.

💡 For scale: An average adult has a VO₂max of about 30–45, a fit amateur 50+, while top endurance athletes reach over 80 (ml/kg/min). Don't compare yourself to the elite — watch your own progress.

📊 Indicative VO₂max values (ml/kg/min, ~20–40 yrs)
Level	Women	Men
Moderate fitness	30–40	35–45
Good fitness	40–50	45–55
Very good	50–60	55–65
Elite athletes	60+	65+

Where do you roughly stand?

30Moderate

40Good

50Very good

60Excellent

70+Elite

A rough VO₂max scale (ml/kg/min) — focus mostly on your own progress.

How to improve it

The most effective way is interval training at high intensity: e.g. repeats of 3–5 minutes near your maximum pace, with rest in between. These push your cardiovascular system to grow stronger.

But be careful: it isn't built with hard days alone. You also need the aerobic base from easy runs, along with a good lactate threshold. It all ties together.

IntervalsVO₂max · ~20% of training

Tempo / Thresholdmoderate intensity

Easy runningaerobic base · 80% of training

Build a big base of easy miles — a little targeted intensity at the top.

❌ Myth: If my VO₂max is low, I can't become a good runner. ✅ Truth: VO₂max is only one factor. Your lactate threshold, running economy and proper training matter just as much.

Your watchEstimate (from heart rate & pace)≈ Estimated VO₂max

Lab testDirect measurement✓ Real VO₂max

A watch doesn't measure VO₂max — it estimates it. Useful for the trend, not for an exact number.

Don't fixate on the number. VO₂max is a tool, not the goal. The real aim is to run, improve and enjoy it. 🏃‍♀️

3 things to remember

It's the "engine" of your endurance.
It rises with intervals on an aerobic base.
Your watch's number is only an estimate.

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