Health Benefits of Running | Medical Research and Studies

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Bone density

Runners have denser bones in the legs than inactive men

Runners had greater bone mineral density at every segment of the lower limb, and similar density in the upper limb — the pattern you would expect if the loading of running is what builds the bone. The gap was widest in the youngest group and narrowed with age.

Sample: 327 male runners vs 212 inactive men, aged 18–65
Source: Krajcigr et al. — PLOS ONE, 2024

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Longevity

Any running at all is linked to living longer

People who ran had a 27% lower risk of death from any cause, 30% lower from cardiovascular disease and 23% lower from cancer. Under 50 minutes of running a week was already enough to show the benefit.

Sample: 232,149 people pooled from 14 studies, 25,951 deaths over 5.5–35 years
Source: Pedisic et al. — British Journal of Sports Medicine, 2020

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Heart

Five to ten minutes a day is linked to lower cardiovascular death

Runners had a 30% lower risk of death from any cause and a 45% lower risk of cardiovascular death than non-runners. Even 5 to 10 minutes a day at a slow pace was associated with the benefit.

Sample: 55,137 adults followed for a mean of 15 years
Source: Lee et al. — Journal of the American College of Cardiology, 2014

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Joints

Recreational running is linked to fewer bad knees, not more

Hip and knee osteoarthritis was found in 3.5% of recreational runners, against 10.2% of non-runners and 13.3% of competitive runners. Read it as reassurance rather than proof: once adjusted, neither comparison reached statistical significance, and the authors say plainly that they could not tell whether these associations were causal or explained by other factors such as previous injury. What it does not show is any sign that ordinary running wears out your knees.

Sample: 114,829 people across 17 studies
Source: Alentorn-Geli et al. — Journal of Orthopaedic & Sports Physical Therapy, 2017

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Injury prevention

Strength training cuts injuries to under a third

Strength training cut sports injuries to roughly a third of the rate in the control groups (RR 0.32). Stretching showed no significant effect (RR 0.96, CI 0.85–1.10). Two limits worth knowing: the strength result comes from a subgroup of four trials, not all 25; and the separate finding that overuse injuries were almost halved belongs to physical-activity programmes as a whole, not to strength training specifically. The trials were mostly team-sport and military populations rather than runners.

Sample: 25 randomised controlled trials, 26,610 participants, 3,464 injuries — across all four intervention types, of which strength training was one
Source: Lauersen et al. — British Journal of Sports Medicine, 2014

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Brain

Staying active is linked to slower cognitive decline

People with higher levels of physical activity had a 35% lower risk of cognitive decline and a 14% lower risk of dementia than those with lower levels. The evidence is about physical activity in general rather than running specifically, so read it as a reason to keep moving for decades, not a claim about running alone.

Sample: 47 cohorts pooled — 21 on cognitive decline, 26 on dementia
Source: Blondell et al. — BMC Public Health, 2014

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These are summaries of published research, linked so you can read the original. They describe what studies found across large groups of people, which is not the same as what will happen to you.

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