Running

Is running safe?

Yes. An everyday run is one of the lower-risk things on our list, and for most people it adds years of life rather than taking them away. The best modern figure comes from UK parkrun, the free weekly 5 km runs: 18 deaths in 29.5 million participations between 2014 and 2019, or about 0.6 micromortsMicromortA one-in-a-million chance of death. It lets you compare the risk of very different activities on one scale.More in the glossary per run. Serious life-threatening events of any kind happened 0.26 times per 100,000 runs, and most were cardiac arrests.

This page covers ordinary recreational running: a few runs a week on roads, paths and trails, plus casual 5 km events. Race day over 42 km is a separate question with its own data; see our page on marathon running, which scores 79.

Why the heart is the real risk

Almost every death during a run is a heart event. In the parkrun data, cardiac arrests made up 57% of serious events and heart attacks (acute coronary syndromes) another 24%. The odds rose with male sex and age, and, notably, were higher in slower runners and people with less running experience. The fit regular is safer than the person who has just started.

The older classic study points the same way. In Rhode Island from 1975 to 1980, 12 men died while jogging, 11 of them from coronary heart disease. That worked out to 1 death per 396,000 hours of jogging for men aged 30 to 64, or about 2.5 micromortsMicromortA one-in-a-million chance of death. It lets you compare the risk of very different activities on one scale.More in the glossary per hour. The authors found that the risk during jogging was about seven times the estimated rate during more sedentary activities, which tells you that hard effort can trigger an attack in a heart already at risk.

That is the trade-off. During the run, risk goes up for a short time. Over a lifetime, it goes down. A study of 55,137 American adults followed for 15 years found runners had a 30% lower risk of death from all causes and 45% lower from heart disease than non-runners, about three extra years of life. Even 5 to 10 minutes a day at a slow pace was enough.

Cars, falls and heat

Traffic is the risk runners control most and think about least. There is no national count of runners killed by vehicles, but a US case series found 9 high school runners killed in 8 collisions during practice and training runs in 2011–2020, most of them on rural roads in the afternoon or evening. Adult runners on roads without pavements, at dusk, face the same pattern.

Falls are the commonest acute injury. In the parkrun data, trips and falls drove most of the 39 minor medical calls per 100,000 runs: grazes, sprained ankles, the odd broken wrist. On trails, roots and wet rock raise the odds.

Heat matters on hot, humid days. A runner pushing hard in heat can develop heat stroke, with confusion or collapse as the warning. It is less common on easy training runs than in races, where people chase a time.

Overuse injuries are common, not serious

If you run for a year, you will probably get injured at some point. A 2015 meta-analysis found 17.8 injuries per 1,000 hours of running in novices and 7.7 in recreational runners. That is roughly one injury every 55 hours of running for a beginner. Knees, shins, Achilles tendons and feet take most of the load.

These injuries keep people off running for weeks, but they rarely need hospital care. That is why we score injury risk at 80 rather than lower. The pattern is clear: novices who add distance too fast get hurt most.

Who should be careful

• Men over about 40 starting from nothing, and anyone with heart disease, high blood pressure, diabetes, high cholesterol, a smoking history or a family history of early heart disease. Talk to your doctor before you begin.
• Anyone with warning signs: chest pain or pressure, unusual breathlessness, palpitations or dizziness on effort. Stop running and get checked. Do not push through it.
• Runners on unlit roads. Dusk and early morning in winter, on country roads without a pavement, are where collisions cluster.
• People returning after illness, especially a fever or recent viral infection. Wait until you are well.

How to run more safely

1. Build up slowly. Start with run-walk intervals and raise weekly time or distance gradually. Most overuse injuries follow a sudden jump.
2. Be seen. Light or reflective clothing and a head torch or clip light after dark. Run facing traffic where there is no pavement.
3. Keep your ears free. Low volume or one earbud out, so you hear cars, bikes and people.
4. Carry a phone and tell someone your route, especially on trails or alone.
5. Slow down in heat. Run early, carry water on long runs and stop if you feel dizzy or confused.
6. Learn CPR. At parkrun and other group runs, bystanders are the first responders. A runner who collapses has the best chance when someone starts compressions at once and an AED arrives within minutes.

How we scored it

Fatality risk (85) reflects about 0.6 micromortsMicromortA one-in-a-million chance of death. It lets you compare the risk of very different activities on one scale.More in the glossary per 5 km run in modern UK data, with older US figures nearer 2.5 per hour for middle-aged men. Injury risk (80) is held back by common overuse injuries, and controllability (76) by hidden heart disease. Help is usually close (85). Compare cycling, where traffic rather than the heart is the main risk, and hiking, where falls and heart attacks share the toll.