Why We Run, and Why It Feels So Good

Running makes little obvious sense. It is tiring, it can hurt, and it usually ends where it began. Yet tens of millions of people around the world lace up their shoes every week, many before dawn or after long working days, and a remarkable number say it is one of the best parts of their lives. The reasons people give are surprisingly consistent, and science has started to explain some of them.

We may be built for it

Humans are poor sprinters compared with many animals, but unusually good at running long distances. In an influential 2004 paper in the journal Nature, biologists Dennis Bramble and Daniel Lieberman argued that endurance running shaped human evolution. They pointed to features such as springy tendons in the legs and feet, large buttock muscles that stabilize the trunk, a ligament that steadies the head and, above all, the ability to shed heat by sweating. Some researchers think early humans may have used persistence hunting, chasing animals over long distances in the heat until they were exhausted. The idea is debated, but it offers one explanation for why running can feel so natural once the body adapts.

The runner's high is real, if unpredictable

Many runners describe moments of calm, euphoria or effortless flow during longer runs. For years, endorphins were credited, but endorphins don't easily cross from the blood into the brain. Research increasingly points to endocannabinoids, the body's own cannabis-like chemicals, which rise during moderate-intensity running. In a 2021 study published in Psychoneuroendocrinology, runners still experienced a runner's high after taking a drug that blocks opioid receptors, suggesting endorphins are not the main cause. Not every run delivers this feeling, and some people rarely experience it, but its possibility is part of the pull.

A reliable mood lifter

Beyond rare highs, regular running is associated with lower rates of depression and anxiety, and exercise is recommended in many clinical guidelines as part of the treatment for mild to moderate depression. Runners often describe a run as the time they work through problems or simply switch off. Running outdoors adds daylight and green space, which have their own links to wellbeing.

A little goes a long way

One of the most encouraging findings for beginners comes from a 2014 study in the Journal of the American College of Cardiology that followed more than 55,000 adults. People who ran, even at slow speeds and for as little as 5 to 10 minutes a day, had a substantially lower risk of death from all causes and from heart disease than non-runners over the following years. Benefits did not keep increasing much with far more running, which suggests that modest, consistent running is enough for health.

The simplicity

Running needs little equipment: decent shoes and clothing suited to the weather. It can be done almost anywhere, at any time, alone or with others. For people with busy lives, the ability to step out of the front door and be exercising within a minute is a big part of the appeal. Travelers find that a run is one of the best ways to explore a new city.

Progress you can see

Running offers clear measures of improvement. A first continuous mile, a faster 5K or a first marathon are concrete milestones. Couch-to-5K programs, which alternate walking and running over several weeks, have helped huge numbers of beginners get started gradually. For many adults, it is the first time since school that they have trained for something and watched themselves improve.

Community

Running can be solitary, but it is also strikingly social. Parkrun, which began in 2004 with 13 runners in Bushy Park in London, has grown into free, volunteer-run, timed 5K events held every Saturday morning in parks around the world. Running clubs, charity races and group runs connect people across ages and backgrounds who might not otherwise meet, and finish lines at big races are full of strangers cheering for one another.

Meaning in the effort

Perhaps the deepest reason is harder to measure. Running asks people to keep going when it would be easier to stop, and to accept discomfort in pursuit of something they chose for themselves. Many runners describe what they learn on long runs, patience, persistence and the knowledge that a hard stretch eventually passes, as lessons that carry into the rest of life.

Starting, or starting again

• Begin with walk-run intervals. Alternate a minute or two of easy running with walking, and gradually extend the running.
• Go slower than you think. An easy pace where you could hold a conversation is right for most runs.
• Build gradually. Increase distance slowly and include rest days to reduce injury risk.
• Get shoes that feel comfortable. Comfort is a reasonable guide when choosing running shoes.
• Check with a doctor if you have heart problems, other health conditions or have been inactive for a long time.

Most runners will say the hardest part is the first few minutes and the first few weeks. Past that, the reasons to keep going tend to reveal themselves.