What is VO2 Max and Why is it the #1 Predictor of Longevity?

While many London health checks focus on dietary markers like cholesterol or weight, the latest longevity science suggests that your cardiorespiratory fitness (CRF) is a far more powerful indicator of your future health⁽¹⁾.

What exactly is VO2 Max?

Simply put, VO2 Max is the maximum amount of oxygen your body can use during intense exercise. It is a measurement of how well your heart, lungs, and muscles work together.

• V = Volume
• O2 = Oxygen
• Max = Maximum capacity

Think of it as the “engine size” of your body. A higher VO2 Max means a more efficient cardiovascular system, better metabolic health, and a significantly lower risk of chronic disease.

Why does VO2 Max matter? (The Longevity Gap)

In terms of predicting how long you will live, VO2 Max is more significant than smoking status, diabetes, or end-stage renal disease⁽²⁾. Even more striking: Being in the “elite” category for your age group is associated with a 5x reduction in mortality risk compared to the “low” category.

The good news: You don't need to be an elite athlete to get the most benefit. Recent data highlights that the single most effective step for longevity is moving from the “low” category to “intermediate.” This initial improvement can reduce all-cause mortality risk by approximately 30–35%, offering one of the best “bang for your buck” of any fitness improvement⁽³⁾.

Traditional London Health MOTs Are Missing VO2 Max — And The Point Of A Preventive Check

Most health checks in London are static. You sit in a chair, they draw blood, and they tell you if you are currently, or soon to be, “sick.” They are so focussed on the mantra of “Don't Die” that they are missing arguably the most important part of a preventive check — helping you “Live Well” now and in the future.

The problem? You can have “normal” blood work but a “poor” VO2 Max. If you only look at your blood, you are missing half the story. At Unbound we test VO2 Max because your result helps you understand your cardiovascular health and predict your capacity to move, recover, and live independently as you age.

Want To Know If You Will Be Able To Get Out Of A Chair When You Are 80?

VO2 Max isn't an abstract metric, it's tangible — it's a direct measure of your functional capacity — the ability of your body to do the things you want to do in life. Want to be able to walk up the stairs quickly, and effortlessly? You need a VO2 Max of roughly 45 mL/kg/min. OK with only being able to walk up slowly? The cost drops to around 32 mL/kg/min.

Getting out of that chair? You need a VO2 Max of around 18–20 mL/kg/min. Falling below this, and you lose your independence^(4,5).

The bad news: From our 30s onwards, our physical capacity naturally declines by approximately 1% per year⁽⁶⁾. This might seem small now, but it compounds over time to determine your future independence. If you find that a fast walk up the stairs makes you short of breath at age 30, that 1% yearly drop in VO2 will take its toll quicker than you think. By age 45, you'll be breathless walking up those stairs slowly. And by your 70s, you risk dipping below the functional threshold required simply to stand up from a chair⁽⁷⁾.

Keep Dancing Into Your 90s. Build Your VO2 Max Resilience Buffer

At Unbound, we go beyond standard blood markers to measure your functional health — assessing your strength, power, and aerobic capacity (VO2 Max). We combine these metrics to calculate your functional trajectory, helping you answer two essential questions: “Is my body working for me?” and “What can I do for my body right now to build better health?”

By assessing your VO2 Max today and providing you with insights, tools, and a personalised plan to build your resilience buffer, we ensure you aren't just surviving in 30 years, but thriving.

Find Out How Much VO2 Max You Have In Your “Retirement Fund” with VO2 Max Testing at Unbound

At Unbound's Shoreditch clinic, we go beyond the basic estimates provided by your smartwatch. We use a submaximal protocol — around 6 minutes on the treadmill, between a jogging and running pace. This is designed to gauge your fitness accurately without the distress of a “max out” test.

Clinical Grade Monitoring: We use calibrated treadmills and high-fidelity Polar H10 heart rate monitoring to track your cardiac response to load.

The “Submax” Advantage: Traditional VO2 testing requires you to run until just before you physically collapse. Our standard protocol is different. We track your heart rate efficiency at a specific workload (running speed) to predict your VO2 Max. This means we get the data we need (pVO2max), but you leave energised, not exhausted.

Want the ultimate level of precision?

Members can also access full VO2 Max protocol testing at Unbound's Shoreditch site. This is the “gold standard” metabolic assessment. It works like this:

• Direct Measurement: You wear a specialised mask that measures the exact concentration of oxygen you inhale and the carbon dioxide you exhale.
• Ramp Protocol: Using a treadmill, you gradually increase intensity until you find your true peak — maximum effort.
• Metabolic Efficiency: VO2 Max testing gives you much more than just your “number”; it can identify your Zone 2 threshold (the ideal heart rate zone for fat burning and building foundational fitness), showing you exactly how to train to improve your longevity.

VO2 Max testing is conducted by VO2 Max specialist partners. Your VO2 Max score and other test data can be imported directly into your Unbound profile, sharpening the accuracy of your “everyday health” plan, and allowing us to plot your physical trajectory with greater precision.

VO2 Max is Part of the Unbound Ecosystem

VO2 Max is a pillar of health, but it isn't the only one. At Unbound, we integrate your VO2 Max results with:

• Targeted blood panel and anthropometric measurements, carefully selected to give you clarity on how your body is functioning.
• Force Plate Analysis: Measuring the strength, power, and stability essential for healthspan.
• The Unbound App: Providing a bespoke training protocol to raise your VO2 Max over time. The Unbound App connects biomarkers, lifestyle, and wearable data into an approach that works around your life.

The Future of London Health is Coming

Our Shoreditch clinic (26 Drysdale St) is opening in February 2026. Due to the high-touch nature of VO2 Max and functional testing, our initial intake is limited.