Scientists Spent 30 Years Finding the Best Exercise Combo for Living Longer

You walk every day, and you feel good about it. But if walking is the only thing you do, you may be missing half of the longevity equation.

Muscle fades quietly from midlife onward. Cardio alone does not stop it, and the cost shows up later as falls, slow recoveries, and a body with less in reserve when illness hits.

Researchers at the Harvard T.H. Chan School of Public Health followed more than 147,000 adults for up to 30 years to find the best exercise combo for living longer. They compared aerobic exercise, strength training, and every mix in between.

Most of us were told to get more steps. Almost nobody was told to pick up something heavy.

The pairing linked to the lowest risk of death is simple. The surprise is how little of one half of it you actually need.

Here is what the numbers show.

The Best Exercise Combo for Living Longer, According to 30 Years of Data

The study was published in 2026 in the British Journal of Sports Medicine. It was led by Harvard Chan researchers, including first author Yiwen Zhang and corresponding author Edward Giovannucci.

The team pooled data from three long running projects: the Nurses’ Health Study, the Nurses’ Health Study II, and the Health Professionals Follow Up Study.

In total, 147,374 people took part (115,834 women and 31,540 men). They averaged 54 years old when the study began.

Every two years, participants reported how much aerobic exercise and strength training they did each week. Aerobic activity included brisk walking, running, cycling, swimming, tennis, and stair climbing. Strength training meant using weights or body weight, such as squats and lunges.

Over the follow up period, 35,798 participants died. That gave the researchers enough data to compare risk across many different exercise habits.

A quick word on units. A MET hour is a way to measure how much energy an activity burns compared with resting. In this study, 7.5 MET hours a week equals the standard 150 minutes of moderate aerobic activity.

How each pattern stacked up

Everything below is compared with people who did under 7.5 MET hours of aerobic exercise a week and no strength training.

Look at what happens when strength joins the picture. According to the authors, adding strength training lowered risk further at every level of aerobic activity up to 45 MET hours.

That is the heart of the finding. Cardio and strength were complementary, not competing.

Here is the honest catch. The 45% result came from 30 to 44 MET hours of aerobic activity, which is roughly four to six times the amount that matches the standard guideline. These were very active people.

You do not need to match them to benefit. Any aerobic amount above 7.5 MET hours was linked to a 26 to 43% lower risk of death on its own.

Why Cardio and Strength Work Better as a Team

The two types of exercise seem to help through different pathways, according to Zhang. Aerobic work is generally tied to better blood flow dynamics, healthier blood fat profiles, and stronger cardiorespiratory fitness.

Strength training is more closely tied to glucose metabolism, body composition, and muscle strength.

Swapnil Patel, MD, a physician who was not involved in the study, points out that strength work also helps preserve muscle mass and reduce frailty. That matters more every year after 50.

The CDC explains why. People lose muscle as they age, and muscle strengthening activity can slow that loss while keeping bones strong and improving balance. Older adults who do moderate strength and balance work are also less likely to fall.

Small trials back up the teamwork idea. Some randomized trials in people with coronary artery disease found that combining both types of exercise produced bigger gains in cardiorespiratory fitness and body composition than aerobic exercise alone.

The Strength Sweet Spot: Less Than You Think

Here is what makes this study unusual. For strength training, the benefits leveled off fast.

People who did 90 to 119 minutes of strength training a week had a 13% lower risk of death from any cause. Above 120 minutes, the researchers saw no extra reduction.

That same range was linked to a 19% lower risk of death from cardiovascular disease and a 27% lower risk of death from neurological disease.

Cancer showed benefits at even smaller doses. People who did just 1 to 29 minutes a week had a 21% lower risk of cancer death, and those doing 30 to 59 minutes had an 18% lower risk.

The neurological result deserves caution. Giovannucci notes that diseases like Alzheimer’s can begin years before diagnosis, and early symptoms may make people exercise less. Causes of death such as dementia are also hard to classify.

In other words, part of that link may run in reverse.

Everyone’s body responds differently. These minutes are averages from huge groups of people, not a prescription, so check with your doctor before building up your own routine if you have a health condition.

How to Build the Combo This Week

You do not need a perfect program. You need the right mix of minutes.

Here is a sample week built from the study’s sweet spot and the CDC’s baseline guidelines.

That adds up to 90 to 120 minutes of strength training, plus 105 to 170 minutes of aerobic activity depending on your Sunday walk. To reach the CDC’s 150 minute baseline, include the Sunday walk or stretch your Saturday outing.

Each strength session should cover your legs, hips, back, abdomen, chest, shoulders, and arms. If you are 65 or older, the CDC also recommends balance activities, such as standing on one foot.

Recovery can take longer as you get older, so leave at least one rest day between strength sessions. The schedule above builds that in.

Dr. David Cutler, a family medicine physician who was not part of the study, suggests working with a trainer when you start. Good guidance early can help you avoid injuries and extra costs later.

Common Questions

Do I need a gym?

No. The study counted exercises done with weights or body weight. Resistance bands, hand weights, and moves like squats and lunges all fit the description.

Is more always better?

For strength training, no. The study found no added benefit above 120 minutes a week.

For aerobic exercise, higher amounts kept paying off in this study, with a 53 to 58% lower risk at 45 or more MET hours. An earlier Harvard analysis of more than 100,000 adults over 30 years, published in Circulation in 2022, found the lowest risk at two to four times the guideline amount. It found no harm from going beyond four times.

How fast will I see results?

This study cannot answer that. It tracked habits that stayed consistent across years, so the findings point to a long game.

Think in seasons, not weeks.

What if I am 65 or older?

The CDC recommends at least 150 minutes of moderate aerobic activity a week, at least two days of muscle strengthening, and balance activities. The study’s message fits right in: do both, not one or the other.

What This Study Cannot Prove

This was an observational study. It shows links, not cause and effect.

People who did more strength training tended to be younger, weigh less, follow healthier lifestyles, and do more aerobic exercise. The researchers adjusted for other factors, but that gap is hard to erase completely.

Exercise habits were self reported, which can introduce errors. The study also had no data on how long each strength workout lasted or how hard people pushed. Some forms of strength training, such as Pilates and calisthenics style workouts, were not included.

Participants were health professionals, so the results may not apply equally to everyone.

None of that erases the pattern. It fits decades of research on both types of exercise, and doctors outside the study team say it supports advice they already give.

Try This Today

The Strength and Cardio Starter Checklist

• Pick three basic moves: squats to a chair, wall push ups, and a row with a resistance band or light weight.
• Work each set until another repetition would be hard to finish without help. That is the CDC’s guide for effort.
• Put two or three strength sessions in your calendar this week, like appointments.
• Keep your walks. Think of them as the other half of the pair, not the replacement.
• Count minutes, not reps. Build gradually toward 90 minutes of strength a week.

When to Stop and Call a Doctor

Get medical help promptly if you notice any of these during or after exercise:

• Chest pain, pressure, or tightness
• Fainting, severe dizziness, or sudden shortness of breath that does not settle with rest
• A racing or irregular heartbeat
• Sharp or sudden joint pain, or swelling that does not ease after a workout

The Simple Takeaway,

Pair your cardio with strength training. In this study, the best results came from combining high aerobic activity with 60 to 119 minutes of strength work a week.

If you do only one thing, add two or three short strength sessions to the walking you already do.

Start where you are, build slowly, and stay consistent.

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making changes to your diet, exercise routine, or medications, especially if you have an existing health condition.