An ‘ultramarathon’ is any race longer than a marathon

Ultrarunning has grown exponentially in the 21st century

Ultrarunning, generally defined as races 50k and longer, has exploded in the past few decades. In 2000, there were 89 official races; in 2023, there were nearly 760. That's a 753% increase.

The marathon is only getting more popular

The marathon has become a part of popular culture, with races in nearly every major city. The largest is the New York City Marathon, which started in 1970. Over 55,000 runners participated in the 2024 race. Its popularity doesn’t appear to be slowing, with younger generations increasingly lacing up their shoes for the race of a lifetime.

Why marathons are 26.2 miles (not 26)

Over 1,100 marathons are run every year, and they all share one oddly specific distance: 26.2 miles. From ancient Greece to a British queen's request, here's the surprising story behind the marathon's decimal.

There are over 800 annual marathons, but only seven deemed World Marathon Majors

The races—Tokyo, Boston, London, Berlin, Chicago, Sydney, and New York City—are on some of the best-known courses in the world and are run by some of the sport’s top athletes.

Explore a guide to the most challenging marathons in the world, including races up Mount Everest Marathon, Mount Kilimanjaro, and the Inca Trail.

The marathon was not an event in the ancient form of the Olympics

The ancient Olympics started with just one footrace, a roughly 3-mile jaunt dubbed the "dolichos." Over the centuries, it blossomed into multiple running events, field events, combat sports, and equestrian events—all performed in the nude. This list showcases eight more lesser-known facts about the ancient Games.

The modern marathon’s arbitrary distance is thanks to the British royal family

In 1908, the London Games set the marathon distance to 26.2 miles to meet the British royal family’s request that the race start at Windsor Castle and end at their royal box. In 1921, that arbitrary distance became the official length for the marathon.

Gen Z is increasingly interested in running marathons

The race has become a popular event for young people. Over 12,000 20-somethings signed up for the New York Marathon in 2024. That's a significant increase from 2023 (9.987) and 2022 (8,039).

The oldest marathoner was 100

Fauja Singh was 100 when he completed the Toronto Waterfront Marathon in 2011 at 8:11:06. Incredibly Singh didn't start running until the age of 89.

The 1904 Olympic marathon was a bizarre spectacle

When the Olympics first came to the US, the race was still a fringe event with few established rules. That led to an absurd comedy, with competitors ingesting poison, hitchhiking 11 miles of the course, and occasionally sipping brandy.

The beer mile blends running and drinking

The event requires competitors to drink a 12-ounce beer for every lap around the track. It may sound like fun (or a nightmare, depending on your disposition), but for some it's a serious business, with an annual world championship.

Runners typically burn 2,600 calories during a marathon

They also burn between 5-10 pounds of water weight, often feel more focused and elated (thanks to increased neurotransmitters), and, oddly enough, temporarily grow about a half-inch shorter due to back muscles tensing.

The marathon’s roots can be traced back to a Greek myth

Legend has it that the first marathon took place in 490 BCE, when Pheidippides, an ancient Greek soldier, ran from the Battle of Marathon back to Athens—approximately 25 miles—to inform his people they’d defeated the Persians. The story is likely apocryphal: No Greek historian mentioned it until over 500 years later.

The first modern marathon was at the 1896 Olympic Games

The modern marathon was created for the revived Olympic Games in 1896, with the course starting in Marathon and ending in Athens. The race was won by Spiridon Louis, a Greek water carrier who surged in the last stretch to the delight of the hometown crowd.

Watch Kipchoge break 2 hours in the marathon

The feat was once considered impossible, but one of the world's greatest marathoners got to work (with the help of a team of scientists and some of the world's most elite distance runners) to break that boundary in Vienna in 2019. The final stretch of the run is an emotional moment for Kipchoge, who doesn't even appear to be winded.

Endurance art strains and exhausts the body

Artists like Marina Abramović are known for testing the limits of human endurance. Endurance art can involve carrying heavy objects or posing uncomfortably for long durations. (This resource contains some artistic depictions of violence.)

Frank Shorter was the first American to win the 26.2-mile Olympic marathon

The running legend became the first American to win the 26.2-mile Olympic marathon in 1972 at 2:21:19. The televised race contributed to a nationwide running boom and helped popularize the event.

The Adidas shoes that helped break the marathon's 2-hour barrier

Two men broke the two-hour mark at the 2026 London Marathon, a feat previously unofficially achieved only by Eliud Kipchoge, thanks to a number of aides not permitted in an official race. Both men who broke the two-hour barrier in London wore the same shoe, the Adizero Adios Pro Evo 3, a new model that weighs just over three ounces.

Some Nike shoes are actually making runners too fast

In 2018, Kenyan runner Eliud Kipchoge lowered the world marathon record to 2:01:39 in a pair of Nike Vaporflys. The unusually thick running shoes sparked controversy around the shoe regulations for professional runners.

Sabastian Sawe holds the world record for the marathon after running the world's first official sub-2-hour marathon.

How endurance athletes can build resilience

Long-distance runners and other endurance athletes can improve their performances using tips explored in this article. Findings from two recent studies show that strength training, high-altitude training, and intense interval sessions are all potential methods for ameliorating long-term athletic capabilities.

Eliud Kipchoge broke the 2-hour mark in a 2019 exhibition

In 2019, Kenya's Kipchoge ran 1:59:40.2, though it was part of an exhibition that included numerous aids—including elite runners cutting his wind and a laser marking the necessary pace—not permitted in officially sanctioned events. As such, it is not eligible for the world record.

Extreme Games rebranded as X Games for global appeal

In 1996, ESPN shortened “Extreme Games” to “X Games” to make the name easier to translate for international broadcasts and to strengthen branding as the competition expanded to global markets.

Running became more popular in the mid-20th century

Once considered a fringe activity, running eventually became an American interest. The trend was spurred in part by the 1966 book "Jogging," which was cowritten by Bill Bowerman, the cofounder of Nike.

Robert Browning memorialized the marathon myth in a 19th-century poem

The story of Pheidippides is not likely true, but that hasn’t stopped the story from spreading. Much of that is thanks to Robert Browning, who enshrined the myth for a new generation in a 1879 poem that described the man dying after delivering word of the victory.

A deep dive into the lives of Guinness World Record addicts

Most people don't hold any world records. Then, there's this group of adventurers, who are racing to own the most. A look at the ambitious world record pursuers racking up hundreds of accomplishments.

An impostor convinced Frank Shorter he’d lost the gold

The 1972 marathon at the Munich Games featured a dramatic finish, thanks to someone posing as a competitor entering the stadium before Shorter. The stunt confused Shorter and the crowd (and enraged the American television announcers) as he entered the final stretch.

Kathrine Switzer was the first official female finisher in the Boston Marathon

A year after Bobbi Gibb’s unofficial finish, Kathrine Switzer registered under an androgynous name to avoid suspicion. Race officials unsuccessfully tried to remove her from the race while she was competing (pictured below), but she ultimately became the first woman to officially finish the race. In 1972, the Boston Marathon changed its rules to allow women to register.

In 1980, a woman cheated her way to a Boston Marathon win

Rosie Ruiz, an unknown runner, finished first in the Boston Marathon, cutting her qualifying New York time by over 20 minutes. The world would soon learn, though, that Ruiz hadn't run the entirety of either race, something that her first interviewer seems to piece together by her strange answers to basic questions.

Chris Nikic is the first person with Down syndrome to complete several marathons

In March 2024, Chris Nikic finished the Tokyo Marathon in 5:39:41. That was the final step towards his ultimate goal of earning the Abbott World Marathon Majors Six Star Finisher distinction. It recognizes runners who have finished Tokyo, Boston, London, Berlin, Chicago and New York.

Why one runner believes Stoic philosophy is important for marathoners

There's plenty of time for thinking while training for a marathon, and Matt Fitzgerald suggests it'd be wise to study the Stoic philosophers to navigate the many frustrations that come with that training. Fitzgerald may be talking about running, but his advice can apply to any seemingly impossible goal.

X Games emerged during “extreme” marketing boom in the 1990s

Launched as the “Extreme Games” in 1995, the event tapped into a trend from the '90s of brands labeling products and events “extreme” to appeal to youth culture—mirroring marketing in soft drinks, snacks, and video games.

Heat-related complications are of greater concern for distance runners than cardiac threats

Analysis of more than 130,000 runners in Tel Aviv events during a seven-year period indicated that the runners were 10 times more likely to experience heatstroke than serious cardiac problems. Scientists suggest that runners should take 10 to 14 days to acclimate to a hot climate before tackling a serious run.

On one sailor's race to sail around the world solo

People wanting to sail around the world in modern times can sign up for the Golden Globe Race, a decades-old, organized sprint to circumnavigate the world by ship. This long-form article follows one woman's journey as she attempted to complete the...

The ultraviolet catastrophe is the infinite energy prediction of classical physics

When scientists first tried calculating the radiation emitted by a heated object, their assumption was that energy was equally distributed across wavelengths and produced infinite energy at low wavelengths. This contradicted observations, which showed near-zero energy intensity at those values.

The X Games is an annual extreme sports competition

The official X Games site offers event schedules, athlete profiles, competition results, and news for both summer and winter editions—along with videos and highlights from skateboarding, BMX, motocross, and other action sports.

The first Boston Marathon was held the next year

In 1897, the manager of the US Olympic team organized the first Boston Marathon, which featured a field of 15 runners. The race took place on Patriots Day, a holiday commemorating the first battles of the American Revolution.

The longest word in English is 189,819 letters long

The wildly-winding word (so long that we can't fit it here) is the proper name for titin, a protein that keeps muscles elastic.

Women were prohibited from the Boston Marathon, so Bobbi Gibb snuck in

Race directors assumed women could not handle the physical demands of the race. In 1966, Bobbi Gibb hid in the bushes near the starting line, then hopped in the race after it began, and became the first woman to finish the Boston Marathon, albeit unofficially.

The tragic story of Jim Peters

At the 1954 Commonwealth Games, Jim Peters, then one of England's best marathoners, was just steps away from victory. He then fell to the ground and staggered about for 11 minutes until medical services took him out of the race. He'd entered the stadium 17 minutes ahead of the pack, but ultimately never finished. It was the last race of his career.

During a 2013 speed run of 'Super Mario 64,' the protagonist was inexplicably warped up to a new location—a glitch that would later be attributed to a cosmic ray flipping a bit within a byte responsible for tracking Mario's height.

Ultraprocessed foods include preservatives, dyes, sweeteners, and more

Processed foods are those that have been altered from their original state, which includes numerous processes that we consider natural, such as cooking or salting. Ultraprocessed foods contain at least one item that wouldn’t be found in a kitchen, like hydrogenated oils or high-fructose corn syrup. It’s estimated that nearly 75% of all foods consumed in the US are ultraprocessed, though that doesn’t mean that all of them are unhealthy. In fact, some, such as prepackaged whole wheat bread and soy milk, are recognized for their health benefits.

One ethnic minority in Kenya, called the Kalenjins, is responsible for 73% of the country's Olympic gold medals in running.

The complicated economics of horse racing

The Triple Crown commands big ratings (and enormous amounts of money in betting) but the sport as a whole is in a precarious position, thanks to limited tracks and an overreliance on subsidies. This special from Freakonomics unpacks what all that means for the future of the sport.

The 'ultrawealthy' in 2026 hold $30M or more

This group of ultra-high-net-worth individuals holds more than double the assets of the top 1% of Americans (and this group holds over a third of all American wealth). These folks go beyond a well-funded retirement plan and a paid-off home common to middle-class households with investments in private equity, commercial real estate, and alternative assets like art.

Joan Benoit was the first woman to win Olympic marathon gold

Benoit was the first woman to win Olympic gold in the 1984 Los Angeles Games marathon, running 2:24:52. She also won the Boston Marathon twice and held the Chicago Marathon record for 32 years. She’s still going, too, running Boston in a blistering 3:04 at age 61 in 2019.

Computer pioneer Alan Turing was also an elite runner

Alan Turing is credited with helping to found modern computer science, in addition to cracking the Nazi code known as Enigma. Beyond these world-historical achievements, the British mathematician also nearly represented his country in the Olympics in the marathon, running just 11 minutes slower than the eventual gold recipient at the 1948 games. Read more on this lesser-known aspect of the man here.

'The man who can drive himself further once the effort gets painful is the man who will win.'

- Roger Bannister (1929-2018)

As of 2025, the longest lightning bolt in the world spanned several states

Although the average bolt measures less than 16 kilometers (10 miles), the 2017 "megaflash" spanned 829 kilometers (515 miles) from eastern Texas to Missouri. Severe thunderstorms are common in the region, where warm, humid air from the Gulf collides with cool, dry air from the north, generating atmospheric instability.

Contestants in an annual extreme sports competition are encouraged to use steroids and growth hormone, using athletes as guinea pigs.