FITNESS TESTS LINKED TO LONGEVITY AFTER 50: THE COMPLETE GUIDE

Search for fitness tests that predict how long you will live and you get the same short list: get down to the floor and back up, stand on one leg, squeeze a grip meter, check your aerobic fitness, time your walk, count your steps. Each one traces back to a real study. What those studies found is that people who scored lower died at higher rates over the following years. That is an association, not a forecast for any one person, and no trial has tested whether raising your score changes how long you live. This guide sets out how each test is done, what the studies measured, and who was in them.

Where I'm coming from: I'm a Marine veteran and an endurance athlete with more than 300 races behind me, and I wrote Win the Long War and Battle Hard After 50. I'm not a physician or a researcher. What follows is what the published studies measured and what my books do with it. When a number is a study finding or a choice from one of my books, I'll say which. I won't tell you what your own score means. That conversation belongs with your physician.

What "Predicts" Means in These Studies

Almost every test on this list comes from a cohort study. Researchers tested a group of people once, followed them for years, and counted who died. Then they compared death rates between people with higher and lower scores.

• Hazard ratio. Most of the results below are hazard ratios. A hazard ratio of 1.84 means the lower-scoring group died at 1.84 times the rate of the comparison group during follow-up, after whatever adjustments the authors made.
• Adjustments differ. Some studies adjusted only for age, sex and body mass index. Others added medical conditions. The authors of the one-leg stand study wrote that recent falls and physical activity were not controlled for.
• Nobody was assigned a score. A cohort study records who had which score and who died. It does not change anyone's score and watch what happens. The authors of the largest grip study wrote that further research is needed to test whether improving strength reduces mortality.

These tests describe groups. They are not a countdown.

The Sitting-Rising Test

How it's done: from standing, sit down on the floor and then stand back up, using as little support as you can. Sitting and rising are each scored out of 5. You lose 1 point for each hand or knee you use for support, and the 2026 study also took off half a point for an unsteady movement. The total runs from 0 to 10. The free Sitting-Rising Test Scorer walks through the scoring.

• Brito and colleagues (2014): 2,002 adults aged 51 to 80, 68% men, in a retrospective cohort. Over a median 6.3 years there were 159 deaths. Compared with the group scoring 8 to 10, adjusted hazard ratios were 5.44, 3.44 and 1.84 from the lowest-scoring group upward. The authors reported that each one-point-higher score went with 21% better survival. The adjustments were age, sex and body mass index.
• Araújo and colleagues (2026): 4,282 adults aged 46 to 75, 68% men, followed for a median 12.3 years, with 665 deaths from natural causes. Death rates ran from 3.7% among people who scored a perfect 10 to 42.1% among those who scored 0 to 4. After adjusting for age, sex, body mass index and clinical variables, the lowest-scoring group had hazard ratios of 3.84 for natural-cause death and 6.05 for cardiovascular death compared with the top group. The confidence interval for the cardiovascular figure was wide: 2.29 to 20.94.

Who was in them: both cohorts were assembled by the same research group in Rio de Janeiro, and about two-thirds of participants were men. In the 2026 study, people volunteered for a medical evaluation focused on fitness, and the authors' summary says none had relevant physical or clinical limitations for fitness testing. More on both studies in The One-Leg Stand and the Sitting-Rising Test.

The 10-Second One-Leg Stand

How it's done: it is a pass or a fail. Can you stand on one leg for 10 seconds? The abstract records only whether each person completed it; the full paper describes the exact foot position and number of attempts.

• Araújo and colleagues (2022): 1,702 adults aged 51 to 75, 68% men, tested between 2008 and 2020. One in five (20.4%) could not complete the 10 seconds. Over a median 7 years, 4.6% of those who passed died, compared with 17.5% of those who did not. After adjusting for age, sex, body mass index and medical conditions, the hazard ratio for those who could not complete it was 1.84 (95% CI 1.23 to 2.78). Adding the test to a model of standard risk factors improved its prediction of death.
• The limit the authors named: recent falls and physical activity were not controlled for.

What trials have shown for balance itself: Lesinski and colleagues (2015) pooled 23 randomized trials in healthy adults 65 and older and found balance training improved measures of balance performance. In their indirect comparison across studies, the largest effects came from programs of 11 to 12 weeks with three sessions a week. The authors rated study quality as limited. Those trials measured balance, not survival. For falls, a 2019 Cochrane review of 108 trials (Sherrington) found balance and functional exercises reduced the rate of falls by 24% compared with control, rated high-certainty evidence, in people averaging 76. More in Exercise and Fall Prevention After 50.

Grip Strength

How it's done: you squeeze a hand dynamometer as hard as you can. The setup changes the number, so it has to be the same every time. Battle Hard After 50 uses this one: seated upright, arm at your side, elbow bent to about 90 degrees, thumb up, three hard attempts with each hand, and the single highest value recorded. The book also says to use the same device for every retest. To see how a reading compares with published norms for your age, use the free Grip Strength by Age calculator.

• The PURE study (Leong, 2015): 139,691 adults aged 35 to 70 in 17 countries, followed for a median 4 years. Each 5 kg lower grip strength was associated with a 16% higher rate of death from any cause (hazard ratio 1.16, 95% CI 1.13 to 1.20) and a 17% higher rate of cardiovascular death. Grip strength was a stronger predictor of death from any cause and cardiovascular death than systolic blood pressure. The study found no significant association between grip strength and fall injuries or fractures.
• UK Biobank (Celis-Morales, 2018): 502,293 adults aged 40 to 69, followed for a mean 7.1 years. Each 5 kg lower grip strength was associated with a higher rate of death from any cause: hazard ratio 1.20 in women and 1.16 in men. The study defined muscle weakness as grip under 26 kg in men and under 16 kg in women, and weakness was associated with higher risk for most of the outcomes studied.
• A pooled analysis (Cooper, 2010): across 14 studies and 53,476 people, the weakest quarter had a death rate 1.67 times that of the strongest quarter. The studies varied a great deal from one another.

The PURE authors wrote that further research is needed to test whether improving strength reduces mortality. More in Grip Strength and the PURE Study.

Cardiorespiratory Fitness (VO2 Max)

How it's done: the studies used treadmill tests in a clinic. You can't run those at home. Battle Hard After 50 uses a one-mile walk test (the Rockport walk) with a formula that estimates aerobic capacity from your time, heart rate, age and weight. The book is plain that this is a field estimate, not a laboratory measurement, and that it is most useful for tracking your own change on the same course.

• The Cleveland Clinic study (Mandsager, 2018): 122,007 patients referred for treadmill testing between 1991 and 2014, average age 53, followed for a median 8.4 years, with 13,637 deaths. Fitness was estimated from treadmill performance and ranked against people of the same age and sex. Compared with the lowest group, the top group (elite) had an adjusted hazard ratio of 0.20. Being below average compared with above average carried a hazard ratio of 1.41, comparable to smoking (1.41) and diabetes (1.40) in the same analysis. The authors reported "no observed upper limit of benefit," and the advantage of elite over high fitness was also present in patients 70 and older.
• Who was in it: patients sent for a clinical treadmill test at one academic medical center, analyzed retrospectively. That is a different group from people who have never had a reason to see a cardiologist.
• Changes in fitness (Blair, 1995): 9,777 men at a preventive medicine clinic took two treadmill tests about five years apart. Men who went from unfit to fit had a 44% lower mortality risk than men who were unfit both times (95% CI 25% to 59%), and each minute of improvement in treadmill time between the two tests went with a 7.9% lower risk. This is as close as this list gets to "improving the score," and it is still an observational study in men.

More in VO2 Max and Mortality: The 122,000-Patient Study and, for how to train the engine, HIIT or Steady Cardio After 50.