Cardio is all you need to live longer
Short answerNo
On this page
No. Cardio is the bigger of the two, and fitness predicts lifespan about as strongly as smoking does. But in 147,374 US adults followed for up to 30 years, 90 to 119 minutes a week of strength training went with a 13% lower death rate on top of whatever cardio people did. The lowest risk of all was in people who did plenty of both.
What we’d do
Do both. Spend most of your exercise time on cardio, walking briskly, cycling, running or swimming, for 150 minutes or more a week. Then lift twice a week, 30 to 60 minutes each time, with legs first. Past 2 hours of lifting a week the extra benefit stopped in the Harvard data, so you don’t need to live in the gym.
If you remember three things
- Lifting adds to cardio. 90 to 119 minutes a week went with a 13% lower death rate, after allowing for aerobic exercise, and 27% lower death rates from diseases of the brain and nerves.
- You don’t need much. There was no extra benefit past 2 hours a week, and a review of 16 studies found the biggest drop at 30 to 60 minutes a week.
- Strength is what gets you up off the floor. Getting up from the floor without your hands, grip and leg strength all predicted death in big studies.
Why everyone believes it
Most of the famous exercise studies were about cardio. Treadmill tests, marathon runners, walkers. Heart health became the reason to exercise, and lifting got filed under looks, bodybuilders and young men. Plenty of people over 50 also worry that heavy weights will hurt them, so they stick to walking.
The cardio part is right. In 122,007 people who ran a treadmill test, the least fit quarter died at about 5 times the rate of the fittest 2 percent. It’s the “all you need” part that doesn’t hold.
A picture from daily life
Think of a house. It needs a good furnace and a sound frame. Cardio is the furnace, keeping your heart and lungs working well. Strength is the frame that holds you up, gets you off the floor and catches you when you trip. You wouldn’t skip the frame because the furnace is new.
What did the Harvard study find?
In 2026, Harvard researchers pulled together three long-running cohorts of US nurses and health professionals, 147,374 people in all, who reported every two years how much they lifted and how much cardio they did. Over up to 30 years, 35,798 of them died.
| What they found | Size |
|---|---|
| 90 to 119 minutes a week of lifting, against none, on top of cardio | 13% lower death rate |
| The same, for death from heart and blood vessel disease | 19% lower |
| The same, for death from diseases of the brain and nerves | 27% lower |
| More than 120 minutes a week | No extra benefit |
| Plenty of cardio plus 60 to 119 minutes of lifting, against too little cardio and no lifting | 45% lower death rate |
Lifting went with a lower death rate at every level of cardio, up to very high amounts. People who did a very large amount of cardio, 45 MET-hours a week or more, had about the same low risk whether they lifted or not.
What do other studies say?
A 2022 review of 16 studies found that muscle strengthening went with a 10 to 17% lower risk of death, heart disease, cancer and diabetes, independent of cardio. The biggest drop, about 10 to 20%, came at about 30 to 60 minutes a week. Above that the curve flattened and even rose a little, and nobody is sure yet what that means.
And the strength you build shows up in the tests that predict how long people live. In 4,282 adults aged 46 to 75, those who scored 0 to 4 on getting up off the floor had 3.84 times the risk of a natural death of people who scored 10. In 139,691 adults, each 11 pounds (5 kg) weaker grip went with a 16% higher death rate. Strength also answers training at any age. In 100 nursing home residents with an average age of 87, ten weeks of lifting raised strength by 113%.
What should a strength session look like?
Pick four or five moves that cover the body, and do 2 or 3 sets of each, heavy enough that the last few reps are hard.
- A squat. To a chair at first, then lower, then with weight.
- A hip hinge. A deadlift with a kettlebell or a bar, or a hip bridge to start.
- A push. Push-ups against a counter, then the floor, or a press with dumbbells.
- A pull. A row with a band or dumbbells, or a pull-down.
- A carry. Walk with a heavy bag in each hand for 30 to 60 seconds.
The US guideline is muscle strengthening at least two days a week. A typical goal is two sessions of 30 to 60 minutes. The Gyroscope app personalizes yours. If you have a heart condition, high blood pressure that isn’t controlled, or a joint problem, start with a physical therapist or a trainer.
Didn’t the people with tons of cardio do fine without lifting?
The sceptic says
The Harvard study itself found that very high cardio gave the same low risk with or without lifting. So if you run a lot, you can skip the weights.
The reply
True in that study, at a level of cardio most people never reach. For everyone else, lifting lowered the risk further at every level of cardio. And lifting does things a death rate doesn’t show, like getting you up off the floor and back up the stairs at 85. These are cohorts too, so lifters may differ in other ways, but the nursing home trials show strength itself responds fast.
7 sources
- Zhang Y and others, Long-term resistance training with all-cause and cause-specific mortality, British Journal of Sports Medicine, 2026pubmed.ncbi.nlm.nih.gov
- Momma H and others, Muscle-strengthening activities are associated with lower risk and mortality in major non-communicable diseases: a systematic review and meta-analysis of cohort studies, British Journal of Sports Medicine, 2022pmc.ncbi.nlm.nih.gov
- Mandsager K and others, Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing, JAMA Network Open, 2018jamanetwork.com
- Araujo CGS and others, Sitting-rising test scores predict natural and cardiovascular causes of deaths in middle-aged and older men and women, European Journal of Preventive Cardiology, 2025academic.oup.com
- Leong DP and others, Prognostic value of grip strength: findings from the Prospective Urban Rural Epidemiology (PURE) study, Lancet, 2015pubmed.ncbi.nlm.nih.gov
- Fiatarone MA and others, Exercise training and nutritional supplementation for physical frailty in very elderly people, New England Journal of Medicine, 1994pubmed.ncbi.nlm.nih.gov
- US Department of Health and Human Services, Physical Activity Guidelines for Americans, 2nd edition, Top 10 things to knowodphp.health.gov
