Your smartwatch knows how many steps you took. Your scale knows what you weigh. And your fitness app may have even assigned you a mysterious “fitness age.”
But here’s a better question:
What can your body actually do?
As the conversation around longevity has exploded, so have tests, scores and gadgets promising to tell us how “young” our bodies really are. Some measurements can provide useful information, but you don’t need a trendy biological age score to start understanding your fitness.
Medical fitness testing can give you objective information about your cardiovascular fitness, strength, body composition, mobility and overall physical function.
And, more importantly, it can show you where you have room to improve.
Your Weight Doesn’t Tell the Whole Story
For decades, we’ve been conditioned to look at the scale as the ultimate measure of progress.
Lost ten pounds? Success.
Didn’t lose weight? Must not be working.
Except fitness doesn’t work that way.
Two people who weigh exactly the same can have dramatically different amounts of muscle, body fat, cardiovascular fitness and physical strength.
That’s why body composition testing can provide more useful context than weight alone. Instead of simply asking, “How much do I weigh?” you’re looking at a much more meaningful question:
“What is my body made of?”
Tracking changes in fat and lean mass can also help determine whether your exercise and nutrition program is actually producing the changes you’re working toward.
VO2 Max: A Number Worth Knowing
If you’ve spent any time in the longevity corner of the internet, you’ve probably heard about VO2 max.
VO2 max measures the maximum amount of oxygen your body can use during intense exercise. Essentially, it helps tell us how effectively your cardiovascular and respiratory systems can deliver oxygen when your body is working hard.
And this isn’t just another wellness fad.
The American Heart Association has called cardiorespiratory fitness an important marker of overall health and has advocated for assessing it as a clinical “vital sign.”
Research continues to reinforce that connection. A large systematic review involving millions of observations found that higher cardiorespiratory fitness was associated with lower all-cause and cardiovascular mortality risk.
The important takeaway isn’t that everyone needs an elite VO2 max.
It’s that knowing your baseline gives you something meaningful to work on.
Strength Matters More Than Looking Strong
Here’s another measurement that deserves more attention: strength.
Muscle isn’t only about aesthetics. We rely on muscular strength to climb stairs, carry groceries, get off the floor, maintain independence and keep doing the things we enjoy as we age.
That’s why medical fitness assessments may include measurements of muscular fitness and strength. The American College of Sports Medicine recognizes muscular fitness, along with cardiorespiratory fitness, body composition and flexibility, as key components of health-related fitness assessment.
Research has also repeatedly found associations between measures such as grip strength and health outcomes, particularly as we get older. Recent 2026 research continues to investigate grip strength as a useful marker in healthy aging.
So while having bigger muscles might be nice, having muscles that actually perform is even better.
Don’t Forget Mobility
Can you squat comfortably?
Reach overhead?
Balance on one leg?
Move through your normal daily activities without pain or restriction?
Those questions may not sound as exciting as a longevity score, but they’re incredibly relevant to your quality of life.
Mobility, flexibility and balance can help reveal limitations that aren’t obvious from your weight, appearance or activity tracker.
Identifying those limitations gives you the opportunity to work on them, before they become bigger obstacles.
The Most Useful Fitness Score Is Your Own Baseline
Here’s where fitness testing becomes particularly valuable.
You don’t need to compete with an influencer, your 25-year-old self or the person on the treadmill next to you.
You need a baseline.
Once you know where you’re starting, you can build an exercise program around what your body actually needs.
Maybe your cardiovascular fitness needs attention.
Maybe you’re aerobically fit but losing muscle.
Maybe your body composition is improving even though the scale hasn’t moved.
Or maybe your biggest opportunity is improving mobility and balance.
Then you train, retest and see what’s changed.
That’s much more useful than chasing an arbitrary “fitness age.”
Test. Train. Retest.
There’s no single measurement that can tell you exactly how healthy you’ll be at 70, or how long you’ll live.
But objective fitness testing can give you something incredibly useful: data about where you are today.
At Maze Medical Fitness Testing, we look beyond weight and appearance to assess the different components of physical fitness and help you better understand your body.
Because the goal isn’t just to live longer.
It’s to build a body that’s capable of doing more with the years you have.
