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Capacity

Physical fitness and longevity: which measures track with a longer life?

The short answer

In observational studies, people with higher measured fitness tended to live longer. The clearest example here is cardiorespiratory fitness from exercise stress tests. In one Canadian study, sit-up performance also tracked with mortality over 13 years. These are links seen across groups of people, not proof that changing one score changes how long you live, and none of them tests the Systematic assessment.

Key numbers

34

Cohort studies pooled in a 2022 meta-analysis of cardiorespiratory fitness and mortality

13

Years of follow-up in a Canadian study of musculoskeletal fitness (ages 20-69)

What kinds of fitness were studied

Cardiorespiratory fitness, usually measured on a treadmill or bike stress test, is the most studied. Earlier research had found that healthy people with higher fitness had lower rates of coronary heart disease and of death from any cause. A 2022 meta-analysis pooled 34 cohort studies to estimate that link more precisely, because its authors judged the existing evidence on it to be limited.

Strength and endurance tests have been studied too. In a Canadian population aged 20-69 followed for 13 years, some parts of musculoskeletal fitness, particularly sit-ups as a measure of abdominal endurance, were linked to mortality.

Grip strength and lower-body function

In the same Canadian study, men in the lowest quarter for grip strength had a relative risk of death of 1.49 compared with the highest quarter. The confidence interval ran from 0.86 to 2.59, so the result was not statistically significant.

When studies of grip strength and mortality are pooled, their results vary a great deal from one study to the next (I2 84.0 percent), so a single pooled figure hides real differences between populations.

The Short Physical Performance Battery combines several lower-body tasks into one score. A meta-analysis of that total score found its link between middling scores (7-9) and death from any cause was stronger in younger study populations. It did not look at any one task on its own.

What this means for reading a fitness assessment

Researchers have pointed out that doctors sorting older adults by risk rely mostly on the diseases a person has and often overlook what that person can physically do.

Physical capacity is worth measuring for that reason. But an association between a fitness measure and mortality does not show cause, and none of these studies tested the Systematic assessment. A Systematic result is a baseline of what your body can do today, not a forecast of your lifespan.

In this capacity

The evidence

Each cited source is labeled according to how it supports the particular claim on this page. Direct test evidence, underlying-capacity findings and population reference values are distinguished from Systematic-defined protocols and standards. Historical development notes are retained internally rather than presented as public evidence. A study of an underlying capacity is never presented as validation of the Systematic test itself.

  • Underlying-capacity evidence New source

    Han et al. (2022). Cardiorespiratory fitness and mortality from all causes, cardiovascular disease and cancer: dose-response meta-analysis of cohort studies. British journal of sports medicine.

    What it found. Pooled 34 cohort studies of stress-test cardiorespiratory fitness and mortality from all causes, cardiovascular disease and cancer, with a separate estimate for each.

    What it does not show. The Systematic tests do not measure cardiorespiratory fitness, and an association does not prove that raising fitness causes the difference.

    PubMed 35022163

  • Underlying-capacity evidence New source

    Kodama et al. (2009). Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis. JAMA.

    What it found. Summarizes earlier research in which healthy people with higher measured cardiorespiratory fitness had lower rates of coronary heart disease and of death from any cause.

    What it does not show. It does not show the effect of adding any particular amount of exercise, and the Systematic tests do not measure this kind of fitness.

    PubMed 19454641

  • Underlying-capacity evidence New source

    Wu et al. (2026). Physical Fitness and All-Cause Mortality in Older Adults. JAMA network open.

    What it found. Notes that risk assessment in older adults leans mostly on disease burden and often overlooks functional capacity.

    What it does not show. It does not show that every fitness component it measured was linked to mortality, and its composite score does not validate the Systematic tests.

    PubMed 42574013

  • Underlying-capacity evidence New source

    Pavasini et al. (2016). Short Physical Performance Battery and all-cause mortality: systematic review and meta-analysis. BMC medicine.

    What it found. The link between middling Short Physical Performance Battery scores (7-9) and death from any cause was stronger in younger study populations.

    What it does not show. It looked at the battery's total score, not a chair stand on its own, and not the Systematic sitting-rising test.

    PubMed 28003033

  • Underlying-capacity evidence New source

    Cooper et al. (2010). Objectively measured physical capability levels and mortality: systematic review and meta-analysis. BMJ (Clinical research ed.).

    What it found. Pooled studies of grip strength and mortality varied widely in their results (I2 84.0 percent).

    What it does not show. It does not validate the Systematic tests or give a clinical cutoff for any of them.

    PubMed 20829298

  • Underlying-capacity evidence New source

    Katzmarzyk et al. (2002). Musculoskeletal fitness and risk of mortality. Medicine and science in sports and exercise.

    What it found. In Canadians aged 20-69 followed for 13 years, sit-up performance was linked to mortality. Men with the lowest grip strength had a relative risk of 1.49 (95% CI 0.86 to 2.59).

    What it does not show. The grip result was not statistically significant, push-ups and sit-and-reach did not show the same pattern, and none of it shows cause.

    PubMed 11984288

The Systematic Healthspan Assessment is a physical baseline. It is not a diagnosis, and it does not estimate a biological age, a disease risk or a lifespan.