If you’ve spent any time in the fitness or longevity world lately, you’ve probably heard two words over and over:
VO₂ max.
Once mostly discussed among endurance athletes and exercise physiologists, VO₂ max has officially entered the mainstream. It’s on smartwatches, fitness apps, podcasts and longevity checklists.
So, why does everyone suddenly care, and should you know yours?
What Is VO₂ Max, Anyway?
VO₂ max is the maximum amount of oxygen your body can use during intense exercise.
Think of it as a measure of how effectively your heart, lungs, blood vessels and muscles work together when your body is being pushed.
Generally, a higher VO₂ max indicates better cardiorespiratory fitness. But this isn’t just a number for marathon runners.
Cardiorespiratory fitness is an important marker of overall health. The American Heart Association has even argued that it should be considered a clinical “vital sign” because of its strong relationship with health outcomes. (American Heart Association)
Why Is VO₂ Max Suddenly Everywhere?
One word: longevity.
The fitness conversation has shifted from simply asking:
“How much do you weigh?”
to:
“How well will your body function as you get older?”
VO₂ max has become part of that conversation because research consistently links higher cardiorespiratory fitness with better health outcomes.
A large 2024 systematic review involving more than 20 million observations found that higher cardiorespiratory fitness was strongly associated with lower risk of cardiovascular disease and all-cause mortality. (British Journal of Sports Medicine)
That doesn’t mean a VO₂ max test can predict exactly how long you’ll live.
It means cardiovascular fitness is something worth paying attention to, and, importantly, something you can work to improve.
Wait…Doesn’t My Smartwatch Already Tell Me My VO₂ Max?
Maybe.
Apple Watches and other fitness trackers can estimate VO₂ max using information such as heart rate, movement, pace and personal characteristics.
And those estimates can be useful for tracking general trends.
But an estimate isn’t the same thing as directly measuring your body’s oxygen consumption during exercise.
During a laboratory VO₂ max test, you exercise while wearing a specialized mask that measures the oxygen you inhale and the carbon dioxide you exhale as the intensity gradually increases.
At Maze Medical Fitness Testing, VO₂ max testing is performed using COSMED metabolic technology to directly assess cardiorespiratory fitness.
So instead of an algorithm saying, “We think your VO₂ max is around here,” you’re measuring what’s actually happening while your body works.
What’s a “Good” VO₂ Max for Your Age?
This is probably the next question everyone asks.
And the answer is: it depends.
VO₂ max naturally varies based on factors including age, sex, genetics, training history and current fitness level.
That’s why searching “good VO₂ max” online and comparing yourself to an elite endurance athlete isn’t particularly useful.
Your result can be interpreted relative to appropriate reference values for your age and sex, giving you context for where your cardiovascular fitness currently stands.
But the most useful comparison may ultimately be:
You vs. future you.
Your first VO₂ max test establishes a baseline. From there, you can train, retest and see whether your cardiorespiratory fitness is actually improving.
Your VO₂ Max Isn’t a Grade
This is important.
A VO₂ max result isn’t a pass/fail test.
If your number isn’t where you’d like it to be, that’s not necessarily bad news. It gives you information you can actually use.
Your results may help you better understand your current cardiovascular fitness, establish more individualized exercise intensities and track changes over time.
Instead of simply saying, “I need to do more cardio,” you now have a measurable starting point.
Can You Improve Your VO₂ Max?
Yes.
Cardiorespiratory fitness can respond to training.
Depending on your starting fitness level and goals, improving VO₂ max may involve a combination of moderate-intensity aerobic exercise, higher-intensity intervals and consistent cardiovascular training.
And this is where testing becomes more valuable than chasing a trendy number.
The goal isn’t simply to know your VO₂ max.
It’s to use that information to train more intelligently, and then see whether what you’re doing is actually working.
VO₂ Max and Longevity: Keep It in Perspective
VO₂ max deserves the attention it’s getting.
But it isn’t a magical longevity score.
You can have a great VO₂ max and still need to pay attention to strength, muscle mass, bone health, metabolic health, nutrition, sleep and other aspects of your overall health.
Think of cardiorespiratory fitness as one important piece of a much bigger puzzle.
That’s also why medical fitness testing can be so useful: instead of obsessing over one metric, you can look at multiple components of physical fitness and understand where your biggest opportunities for improvement may be.
The Bottom Line
VO₂ max might be having a moment, but the science behind cardiorespiratory fitness isn’t a fad.
Knowing your VO₂ max can give you an objective look at how efficiently your body uses oxygen, establish a cardiovascular fitness baseline and give you something meaningful to track as you train.
At Maze Medical Fitness Testing, our VO₂ max test directly measures cardiorespiratory fitness using COSMED metabolic testing technology, giving you individualized data you can actually use.
Because the goal isn’t to have the best VO₂ max on the internet.
It’s to build a fitter, more capable version of you.
Book a VO₂ Max Testing at Maze Medical Fitness Testing Today!
