When people think about retirement readiness, the conversation usually starts with money.
Will my assets last?
How much income can I sustainably draw?
They are important questions. But they are not the whole picture.
Most retirement plans carry a set of assumptions that often go unchallenged: that you will live a long time, remain mentally sharp, and be physically capable of enjoying the lifestyle your financial plan supports. That final assumption is rarely tested, yet it may be the most decisive factor in whether retirement feels expansive or constrained.
The Hidden Gap in Traditional Retirement Planning
A well-funded retirement without physical capacity often shrinks. Travel becomes harder. Independence narrows. Confidence fades. Financial security, on its own, does not guarantee freedom.
This is where a different indicator of retirement readiness deserves attention.
VO₂ Max: A Measure of Capacity, Not Athleticism
VO₂ max is the gold-standard measure of cardiovascular fitness. In simple terms, it reflects how efficiently your body uses oxygen during sustained effort. This is not about elite performance or training like an athlete. It is about capacity.
Capacity to move confidently.
Capacity to remain independent.
Capacity to live the life your money was designed to fund
Higher cardiovascular fitness has been consistently linked to better cognitive resilience, lower risk of heart disease and dementia, greater independence in later life, and more years of quality living. In retirement terms, VO₂ max is a proxy for how long life stays capable, not just how long it lasts.
Why Midlife Matters More Than Most People Realise
Cardiovascular fitness behaves much like investing. It compounds.
Work done in your 40s and 50s builds physiological reserve, slows age-related decline, and protects future independence. Time is the most powerful force at play. Delaying action makes the returns smaller and the effort required much greater.
Planning to “get fit later” often means slower recovery, higher injury risk, reduced motivation, and less capacity to build meaningful gains. It is the physical equivalent of starting serious investing at the point of retirement rather than decades earlier.
The Practical Reality: You May Already Be Tracking This
For many people, this indicator is already sitting quietly on their wrist.
Most modern smartwatches estimate VO₂ max during regular exercise, including Apple Watch, Garmin, Fitbit and WHOOP devices. No lab tests are required. No additional effort is needed. The data accumulates in the background as you live your life.
A Simple New Year Check-In
A practical check-in takes minutes:
Look at your current VO₂ max estimate
Review the trend over the past six to twelve months
That trend is not a judgment. It is a signal.
What matters most is not elite numbers, but direction. Avoiding decline, holding steady, or gently nudging the trend upward all deliver meaningful long-term payoffs. Small improvements compound over time, just like financial returns.
Redefining Retirement Success
Money funds retirement. Fitness determines whether you can live it.
With cardiovascular capacity, independence lasts longer, confidence stays higher, and life remains broader. A retirement plan that integrates both financial capital and physical capacity is more resilient, more flexible, and ultimately more valuable.
This year, consider adding a different kind of retirement readiness indicator to your thinking. Check your VO₂ max occasionally. Pay attention to the trend. Because in fitness, just like investing, the greatest returns go to those who start early and stay consistent