The topline. Aerobic exercise has owned the longevity conversation for decades, while the long term payoff of lifting weights stayed uncertain. A study from the Harvard T.H. Chan School of Public Health, published in the British Journal of Sports Medicine, now gives the resistance side a number. Tracking 147,374 adults for up to 30 years, the researchers found that 90 to 119 minutes of strength training a week marked the point of lowest mortality risk, and that more time did not buy more benefit.

Key facts

The analysis pooled three long running US cohorts: 31,540 men in the Health Professionals Follow-Up Study from 1992 to 2022, and 115,834 women in the Nurses’ Health Study and Nurses’ Health Study II. Participants reported their exercise habits every two years, so the exposure reflects decades of behavior rather than a single questionnaire. Strength training meant pushups, squats, lunges, and traditional weightlifting. Over follow-up, 35,798 participants died.

Against no resistance training, and after adjusting for aerobic activity, 90 to 119 minutes a week was associated with a hazard ratio of 0.87 for death from any cause, 0.81 for cardiovascular death, and 0.73 for neurological death, mostly dementia. Above about 120 minutes a week, the curve flattened: no additional mortality benefit appeared. Cancer mortality was lower only at small resistance doses, one to 59 minutes a week, not at higher ones.

The combination mattered most. Adults with both high aerobic activity and moderate resistance training had the lowest mortality of any group, roughly 45 percent below adults with little aerobic activity and no resistance training. Aerobic activity alone, above 7.5 metabolic equivalent hours a week, was associated with 26 to 43 percent lower mortality.

Clinical relevance

This is a prescription clinicians can actually give. Two or three sessions of 30 to 45 minutes, spread across the week, lands squarely in the plateau zone, and the study’s own message for inactive patients is that small amounts still matter and a routine built gradually beats an ambitious one abandoned. For patients who already walk or run, the finding reframes strength work as the missing half of the program rather than an optional extra, especially for the neurological outcome, where the 27 percent figure is the largest relative reduction in the study.

The caveats travel with the number. The data are observational and activity was self reported, so people who lift regularly may differ from those who do not in ways the analysis could not fully capture. The cohort is also health professionals, a group healthier and more active than average: three quarters already exceeded the recommended 150 minutes of weekly aerobic activity. Read the dose as a reasonable target, not a guarantee.

120

That is the weekly minute mark where the mortality benefit of strength training stopped climbing in this cohort. It is the most useful number in the paper for the exam room, because it answers the question patients actually ask: how much is enough. The answer here is about two hours, and the second most useful number is the floor. Even one to 59 minutes a week tracked with lower cancer mortality, which means the patient doing a single weekly session is already in the game.

What we’re reading

  • British Journal of Sports Medicine: the 2026 cohort analysis of resistance training and mortality.
  • Health Professionals Follow-Up Study and Nurses’ Health Studies: the three cohorts behind the data.
  • HealthDay: the June 2026 summary of the findings with hazard ratios.