Ninety to 119 minutes a week. That is the number, and above 120 minutes it stops mattering. In a cohort of 147,374 adults tracked for up to three decades, the mortality curve for strength training flattened at roughly two hours a week and refused to bend further.
The finding comes from a Harvard T.H. Chan School of Public Health analysis published June 2, 2026, in the British Journal of Sports Medicine. It pooled three of the longest-running cohorts in American epidemiology: the Health Professionals Follow-up Study, the Nurses' Health Study, and the Nurses' Health Study II.
The scale is what gives it weight. Over the follow-up, 35,798 participants died — a large enough event base to draw dose-response curves for specific causes of death, not just the blunt all-cause number.
Over three decades, 35,798 participants died — a large enough event base to draw dose-response curves for specific causes of death, not just the blunt all-cause number.
Here is the core result. Compared with people who did no resistance training, those logging 90 to 119 minutes a week had a 13% lower risk of dying from any cause (hazard ratio 0.87).
The same dose tracked with a 19% lower risk of cardiovascular death and a 27% lower risk of death from neurological disease — the category that includes Alzheimer's, dementia, and Parkinson's.
And then the ceiling. Push past 120 minutes a week and the benefit did not grow. The curve plateaued. For anyone who has ever felt guilty about not living in the gym, the data is unusually kind: three sessions of 30 to 40 minutes captures essentially the whole effect.
But the causes of death did not all respond to the same dose, and that is the more interesting story buried in the numbers.
Cancer mortality behaved differently. The protective signal there appeared at the low end and vanished at higher volumes — a 21% lower risk at just 1 to 29 minutes a week, and 18% lower at 30 to 59 minutes (per E1/E2 reporting). For cancer, a little regular lifting seemed to do the work; more did not add to it.
The authors' own conclusion names this tension plainly: "different amounts of resistance training may be needed to optimize benefits across outcomes." There is no single perfect dose. There is a range, and where you land in it depends on what you are trying not to die of.
Now the part that matters most for anyone building a weekly routine: strength training alone was the weaker lever.
On its own, 60 to 119 minutes of resistance training per week bought a 7 to 11% mortality reduction versus doing neither. Respectable, but modest.
Aerobic exercise, by itself, reportedly did far more heavy lifting — any amount above 7.5 MET-hours a week was linked to a 26 to 43% lower risk of death, per ScienceDaily's reporting.
The combination is where the numbers turn dramatic. Participants who paired 30 to 44 MET-hours of weekly aerobic activity with 60 to 119 minutes of strength training had a 45% lower risk of death (hazard ratio 0.55).
At the very top — 45 or more MET-hours of aerobic activity a week — mortality risk dropped 42 to 47% (hazard ratios of 0.53 to 0.58) regardless of how much strength work was added.
The practical read: strength training is a multiplier layered on top of cardio, not a substitute for it. As the researchers put it, adding resistance training "further reduced mortality risk across all levels of aerobic activity up to 45 MET hours/week."
That framing matches current guidance, which asks for both — roughly 150 minutes of moderate aerobic activity plus muscle-strengthening work — and it explains why fewer than a quarter of American adults meet the combined target. Two things are harder to sustain than one.
What counts as strength training here was refreshingly ordinary. The questionnaires captured weightlifting, weight machines, and bodyweight moves like push-ups, squats, and lunges — no barbell required.
Edward Giovannucci, the study's senior author, framed the takeaway for the least active. "For people who are less active, the key message is that small amounts can still matter," he said. "Building a routine gradually may be more important than trying to do a lot at once."
Now the caveats, because this is where the evidence level has to be stated honestly.
This is an observational study. It cannot prove that lifting weights caused people to live longer — only that the two travel together. Randomization was never in the design.
The exercise data was self-reported on questionnaires filled out every two years, which invites recall error and rounding. Nobody measured how heavy the weights were, how close to failure participants trained, or how long individual sessions ran.
Whole categories of resistance work — calisthenics, Pilates — were left out of the analysis entirely.
The neurological finding deserves the most caution, and Giovannucci said so directly. Neurodegenerative disease "can begin many years before diagnosis, and early symptoms may reduce a person's ability or motivation to exercise." In plain terms: the disease may quietly suppress exercise years before death, making inactivity look like a cause when it is partly a symptom. Dementia is also hard to classify accurately on a death certificate.
There is a confounding shadow over the whole thing worth naming. People who strength-trained more were, at baseline, younger, leaner, and did more cardio. The authors adjusted for age, diet, smoking, body weight, and alcohol — but adjustment is not the same as a control group.
So what survives all that? A consistent, biologically plausible association across 147,000 people and 30 years, aligned with prior work linking resistance training to lower cardiovascular risk and preserved cognitive function.
The number to carry out of it is modest and specific: 90 to 119 minutes a week, split into a few short sessions, on top of your cardio — not instead of it.
More than that buys you nothing extra for longevity, and the guilt about not doing more is, on this evidence, unfounded.