Best Exercise to Live Longer: What the Research Actually Shows

There are many ways to move your body. But there are three broad categories of movement, and for optimal health, try to do some of each.

Aerobic exercise — getting out of breath

This is any movement that raises your heart rate and makes you breathe harder. Walking briskly, cycling, swimming, dancing, running up stairs. Your body doesn't care what it is. What matters is that your heart and lungs are working hard enough and triggering those healthy adaptations.

When you do this regularly, your heart gets stronger and pumps more blood per beat. Your muscles build more mitochondria — the structures that convert oxygen into energy. Your blood vessels become more flexible. The result is a higher VO2 max — your body's capacity to use oxygen — which is the single strongest predictor of how long you'll live.

A study of 122,007 patients found that people with low cardiovascular fitness had five times the mortality risk of the fittest group. That gap is larger than the gap between smokers and non-smokers. And a study of 750,302 veterans found that every incremental improvement in fitness reduced mortality by 13–15%, with no upper limit. The more fit you are, the better.

Strength training — loading your muscles

After about 40, you lose muscle every year if you don't actively work against it. Roughly 0.5–1% per year at first, accelerating as you age. By 80, the average person has lost around 30-40% of their muscle mass.

This matters far more than most people realise. Weaker muscles don't just mean frailty — they mean a body less equipped to handle what life throws at it. Surgery, illness, cancer treatment, a fall — your muscle mass and strength determine how well you cope and how quickly you recover.

Beyond that, active muscle is a powerful health asset in its own right. Every time your muscles contract, they release signalling molecules that reduce inflammation, improve how your body handles blood sugar and fat, support immune function, and protect your brain. The more muscle you maintain and use, the more of these benefits you get.

What preserves and builds muscle is resistance — working your muscles against load. Weights, bands, bodyweight exercises, heavy gardening. The body registers the effort and builds them stronger. And it works at any age. Studies in adults in their eighties and nineties have shown significant muscle and strength gains from resistance training. It's never too late to start. Explore my exercise content → for more on getting started.

The dose is remarkably low. Any amount of resistance training reduces all-cause mortality by 15%. The optimal benefit comes from just 30 to 60 minutes per week — one or two short sessions. More than that doesn't add much.

Regular movement — avoiding prolonged stillness

This is the one most people miss. Your body has systems that only stay active when you move regularly throughout the day — enzymes that clear fat from your blood, processes that regulate blood sugar, signalling molecules released by contracting muscles.

When you sit for hours without interruption, these systems shut down. Prolonged sitting is associated with a 91% increase in type 2 diabetes risk, and mortality risk starts climbing meaningfully above about seven hours of sitting a day. That's total time sittig, including at your desk, on the commute, watching TV in the evening.

And this happens regardless of whether you exercise. Meeting the recommended 150 minutes of weekly exercise still leaves you at elevated risk if you're sitting for eight or more hours a day. Both exercise and regular movement are needed — one doesn't replace the other.

But you don't need to be on your feet all day. Interrupting long periods of stillness — a short walk, taking the stairs, standing during a phone call — keeps these systems running. Even 1-2 minutes every hour is associated with a 33% lower risk of dying.

The combination — and why variety helps

But here's an important takeaway point - combining these three types of exercise is dramatically more effective than doing just one, and is optimal for health. A study of nearly 480,000 adults found that aerobic exercise alone reduced mortality by 29%. Strength training alone: 11%. Both combined: 40%.

And a 2026 Harvard study of 111,000 adults, followed for over 30 years, found that exercise variety — doing different types of activity — reduced mortality by a further 19%, independent of total exercise volume. The likely reason: different activities stress different muscles, movement patterns, and energy systems. The body adapts to each one separately, so variety produces a broader range of adaptations than repeating the same thing.

More ways of challenging the body means more ways the body improves.