The two cheap tests that predict how long you'll live

If you handed a longevity clinic 100,000 dollars, it would scan you, sequence you and give you a binder. But two of the strongest predictors of how long you will live are not in that binder, and you can measure both for almost nothing. One is your cardiorespiratory fitness. The other is your grip strength.

Test one: how fit your heart and lungs are

Fitness here means VO2 max, the amount of oxygen your body can use at full effort. In 2018, researchers published a study of more than 122,000 adults in JAMA Network Open and found that cardiorespiratory fitness was the single strongest predictor of survival they measured. The least fit group carried a risk of dying comparable to, or worse than, living with smoking or diabetes. An earlier analysis put rough numbers on it: each meaningful step up in fitness was linked to around 13 percent lower risk of death from any cause.

Test two: how strong you are

The simplest proxy for strength is how hard you can squeeze. The Lancet's global PURE study followed nearly 140,000 people across 17 countries and found that every 5 kilogram drop in grip strength came with a 16 percent higher risk of dying, and a 17 percent higher risk of dying from heart disease. Grip strength predicted death better than blood pressure did. A cheap handheld gripper measures it in seconds.

Why do two humble numbers beat a six-figure workup? Because they are not really measuring your hand or your lungs. They are measuring the whole system: your heart, your muscles, your metabolism and your capacity to keep living independently. They are integrated signals of how robust your body is, which is what "longevity" is supposed to mean.

The good news: both are trainable

Both improve with training, and the training is not exotic. Fitness responds to regular aerobic work: brisk walking, cycling, swimming or running, a mix of easy efforts and the occasional harder one. Strength responds to lifting things two or three times a week, progressively heavier, across the big muscle groups. That is the whole protocol. No cryochamber, no IV drip, no methylation report required.

You can measure your starting point without a membership, too. Many gyms and clinics offer a VO2 max test, and a simple step or treadmill test gets you close. A grip dynamometer costs less than a month of most wellness apps. Check both a couple of times a year, watch the trend, and you have a longevity dashboard more predictive than most of what the luxury clubs are selling.

The longevity industry wants aging to feel complicated and expensive, because complicated and expensive is what it sells. The evidence keeps pointing somewhere much plainer: move your body hard enough to be fit, keep enough muscle to be strong, and you have done more for your lifespan than almost anything with a waitlist.

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Do biological age tests actually work?, and the truth about $100,000 longevity clubs.