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Over the past century, “maximal oxygen uptake” has turned out to be a valuable marker of both endurance and health.No tidbit of physiological jargon has achieved more popular renown than VO2 max, also known as maximal oxygen uptake. And, for the past century, none has been so consistently misunderstood. A new commentary in the International Journal of Sports Physiology and Performance, led by Grégoire Millet of the University of Lausanne, marks the 100th anniversary of the landmark paper by A. V. Hill and Hartley Lupton that first described VO2 max. It’s a big milestone, and it offers a good excuse to take a closer look at what VO2 max really means and why it (sometimes) matters.

A.V. Hill was a 4:45 miler and already had a Nobel Prize for work in muscle physiology when he and Lupton began studying VO2 max. The experiments involved subjects running around Hill’s back garden in Manchester with air bags strapped to their back to measure how much oxygen they used. The faster they ran, the more oxygen they needed—but only up to a certain point. Eventually, oxygen consumption plateaued, even as they continued to accelerate.

Beyond this plateau—what’s now known as VO2 max, indicating the maximum volume per unit time of oxygen (O2)—they had to rely on anaerobic energy pathways, going into what Hill called “oxygen debt.” This debt couldn’t be sustained for long thanks to rising lactic acid, which meant that VO2 max effectively marked the limits of sustainable effort. In other words, VO2 max was an objective measure of endurance.

The current understanding of exercise metabolism has evolved in a few respects since Hill’s time. Physiologists no longer talk about oxygen debt, and lactate (not lactic acid) is considered a marker of fatigue but not its direct cause. But the basic idea remains the same: there’s a limit to the rate at which your body can take in and use oxygen, and having a higher limit augurs well for both performance and health.

The initial understanding of VO2 max was that it was a measure of cardiovascular function, limited primarily by how rapidly your heart could pump oxygen-rich blood to your muscles. For elite endurance athletes, that’s still a pretty good approximation: aerobic monsters are distinguished primarily by a large and compliant heart that can pump huge volumes of blood with each stroke.

But over time, researchers realized that the limits of oxygen uptake are best thought of as a cascade with numerous steps. You have to inhale oxygen into your lungs, diffuse it into your bloodstream, pump it to your muscles, diffuse it into your muscles, and then your mitochondria have to use it to generate ATP. Each of those steps can become a limiting bottleneck in certain conditions, so there isn’t one single path to altering VO2 max.

There are two ways of quantifying your VO2 max. The absolute value is expressed in liters of oxygen per minute: a well-trained endurance athlete, for example, might be able to consume 5 L/min of oxygen. The relative value, which is the more commonly discussed number, is simply the absolute value divided by your weight in kilograms. If that same endurance athlete weighed 70 kilograms, their relative VO2 max would be 71 ml/min/kg.

The standard method of measuring VO2 max, originally developed as an offshoot of the infamous Minnesota Starvation Study during World War II, is a treadmill test (or the equivalent with some other form of exercise like a stationary bike), lasting six to 12 minutes and getting progressively harder in stages until you max out. But what does it mean to max out? There are various criteria: oxygen consumption reaching a plateau, heart rate reaching a plateau, lactate levels exceeding 8.0 mmol/L, perceived exertion greater than 17 on a scale of 6 to 20, respiratory exchange ratio (a comparison of much carbon dioxide you exhale compared to how much oxygen you’re consuming) of greater than 1.1.

The reason for all these criteria is that the idealized picture of a steady increase in oxygen consumption followed by a plateau often doesn’t show up in real life. And even when it does, it’s not an invariant number: your VO2 max when kayaking will be smaller than when you’re running, for example, because you’re using smaller muscles that can’t gobble up as much oxygen. (That’s why rowers tend to have some of the highest absolute VO2 max values, because they’re huge and they’re using both arm and leg muscles. Cross-country skiers have some of the highest relative values, because they’re also using arms and legs but are generally much lighter than rowers.)

There are even a few studies that have found different VO2 max values depending on the details of the treadmill protocol. How can it be the ultimate objective measure of endurance if its value depends on how you test it? Is the apparent plateau just your brain deciding that you’ve had enough and should step off the treadmill? These and other controversies persist. My take: the VO2 max plateau is real and dictated by physiology, but it’s not as clear-cut a threshold as once thought.

If you tested all the runners on the start line of an Olympic distance race, their VO2 max values wouldn’t tell you much about how they’d place. They all have high values, and the race won’t necessarily be won by the runner with the highest value. Eliud Kipchoge, for example, reportedly has a relatively unexceptional value for an elite marathoner. In that sense, VO2 max isn’t a great predictor of running performance. And the cyclist with the highest ever reported VO2 max, Oskar Svendsen, didn’t end up setting the world alight, as I recounted a few years ago.

On the other hand, if I had to predict the race finishing order of 100 people randomly picked from the street, and I was allowed one physiological test, I’d opt for VO2 max. In that diverse population, VO2 max values would be all over the map, and those with the highest values would likely finish at or near the front. So in that sense, VO2 max is a great predictor. To put it another way, a high VO2 max is a necessary but not sufficient condition for endurance success. It’s your ticket into the game.

You could argue that VO2 max has greater value as a predictor of health and longevity than of athletic success. While the relationship between exercise habits and longevity remains a little hazy, with some people arguing that too much is bad for you, the link between VO2 max and longevity is unambiguous: higher is better. In fact, the American Heart Association has argued the VO2 max should be considered a “vital sign” and be regularly measured or estimated by doctors.

Back in the 1990s, the Heritage Family Study trained about 500 people from 100 different families for 20 weeks. On average, they were able to boost their VO2 max by about 20 percent. But they saw a wide range in responses: some people saw more than twice as big an increase, while others basically didn’t increase at all. And that variation seemed to cluster within families. The researchers estimated that about half the VO2 max training response was dictated by genetics.

The idea that some people don’t improve their VO2 max at all even with regular training remains controversial. A few different studies have taken aim at this idea, and shown that if you take non-responders from a study and have them either train more or train harder, everyone will eventually respond. Still, it’s clear that some people can increase their VO2 max more easily than others.

Trained athletes eventually hit a point of diminishing returns, although long-term structural adaptations like the size of your heart and the density of capillaries distributing blood can continue to improve. A meta-analysis a decade ago found that interval training can produce substantial improvements, with the biggest bang from intervals lasting three to five minutes per rep. The highest recorded values tend to be around 90 ml/kg/min in men and 80 ml/kg/min in women, with the sex differences attributable to higher body fat and lower hemoglobin levels in women.

As important as increasing your VO2 max is, the bigger challenge for many of us is slowing its decline. After age 25, it typically drops about ten percent a decade. According to a recent analysis, athletes who keep training can slow that decline to about 5 percent a decade, but those who fall off the wagon might see even steeper declines.

Overall, Millet and his colleagues conclude that VO2 max is “a healthy and active centenarian” that remains important in both endurance sports and as a measure of cardiovascular health. It’s not the ultimate barometer of fitness, but neither is it a meaningless detail. If you get a chance to have yours tested, for example by volunteering for a study at a local university, I highly recommend it. It can be fun to learn about your own physiology—and, during the final stage of the test where you keep pushing until you’re on the verge of being thrown off the back of the treadmill, your psychology.

Jakob Ingebrigtsen brought his remarkable 2026 season to a fitting close on home soil, winning the men’s street 1500m at the inaugural Runfest Norway in Sandnes on Friday.

Competing in front of an enthusiastic hometown crowd, the Olympic and world champion took control of the race from the early stages and maintained his authority through the finish, stopping the clock at 3:40.7.

Andreas Fjeld Halvorsen followed in second in 3:43.3, while Sigurd Tveit completed the podium in 3:47.8.

The unusual street race added another dimension to the occasion, with 273 runners taking part on the same road and sharing the course with one of Norway’s most accomplished distance runners. For the recreational participants, it offered a rare opportunity to compete alongside Ingebrigtsen in an event that brought elite athletics and mass participation together.

The victory also provided a fitting final chapter to a season that began with significant uncertainty for Ingebrigtsen. After undergoing major Achilles surgery in February, the Norwegian was forced to miss a substantial portion of the summer campaign as he worked his way back to full fitness.

His return, however, quickly developed into another championship-winning chapter. In Birmingham, Ingebrigtsen captured European 5,000m gold before adding another major title at the inaugural World Athletics Ultimate Championship in Budapest, where he won the 5,000m.

Those performances transformed what could have been a disrupted season into another year defined by championship success and a determined return to the highest level.

Now, with the Sandnes victory added to his 2026 record, Ingebrigtsen closes the year exactly where it began in spirit — overcoming adversity, rebuilding his form and once again competing at the front.

From Achilles surgery in February to major championship victories and finally a 1500m win before his hometown crowd, the Norwegian has given his 2026 season a memorable final scene.

Olympic 100m hurdles champion Masai Russell has announced her engagement to longtime partner Robert “Robbie” Springfield, adding a major personal milestone to the remarkable journey of one of America’s leading track and field stars.

Russell shared the news with her followers, revealing that Springfield had proposed and that she had accepted. Reflecting on their relationship, the Olympic champion described him as her best friend and expressed her excitement about spending the rest of her life with him.

The couple’s relationship dates back to their college years at the University of Kentucky, where both were student-athletes and competed in track and field. Russell established herself as a standout hurdler, while Springfield competed in the long jump, giving them a shared understanding of the demands, sacrifices and pressures that come with pursuing success in athletics.

Springfield has since transitioned from competition into coaching. A former collegiate long jumper, he is now part of the coaching staff at Morehead State University, where he works with the programme’s sprinters and jumpers.

Their relationship has developed alongside Russell’s rise to the top of the sport. The defining moment of her career came at the Paris 2024 Olympic Games, where she captured gold in the women’s 100m hurdles, securing her place among the sport’s Olympic champions.

Away from competition, Springfield has remained a familiar part of Russell’s journey, sharing in the demanding periods of training and competition that accompanied her pursuit of Olympic success. Their connection has consequently grown from a college athletics relationship into a long-term partnership.

The engagement now marks another significant chapter for Russell, this time away from the track. After reaching the pinnacle of her sporting career in Paris, the 100m hurdles champion is beginning a new phase of her personal life alongside a partner who has been part of her journey since their university days.

From competing on the same collegiate stage to building a future together, Russell and Springfield’s story has evolved alongside two careers shaped by track and field. The Olympic champion will now balance this new personal chapter with her continuing ambitions in athletics

The women’s race at the 2026 TCS Amsterdam Marathon is shaping up to be one of the most competitive editions in recent years, with a deep international field set to take on the fast Dutch course on Sunday, October 18.

At the centre of the contest will be four Ethiopian athletes who have already broken the 2:20 barrier, creating the prospect of a fascinating battle for victory and a possible assault on the course record of 2:16:52.

Defending champion Aynalem Desta will return to Amsterdam looking to retain her title after producing the biggest performance of her career at last year’s 50th edition. Desta won in a personal best of 2:17:37, establishing herself among the leading marathoners in the field and setting the benchmark for this year’s contenders.

Standing in her way will be fellow Ethiopian Meseret Belete Tola, a former Amsterdam champion who knows exactly what it takes to succeed on the course. Belete Tola captured the 2023 edition in 2:18:21, and her return adds another layer of experience and proven quality to an already formidable lineup.

The field also includes Mestawut Fikir Truneh, who arrives with an impressive marathon pedigree. Truneh finished runner-up at the 2024 Berlin Marathon in 2:18:48, demonstrating her ability to compete at the highest level on one of the world's major marathon stages.

Completing the quartet of sub-2:20 Ethiopians is Buze Diriba, whose personal best of 2:19:34 places her firmly among the leading contenders. With four athletes possessing credentials below 2:20, the race is likely to develop into a tightly contested battle from the opening kilometres.

The depth extends well beyond the leading quartet. Desi Jisa Mokonin, representing Bahrain, Yeshi Kalayu Chekole of Ethiopia and Nazret Weldu Gebrehiwet of Eritrea have all established themselves as serious marathon competitors with performances approaching the 2:20 mark.

Another major name to watch is Abeba Aregawi, the former 1500m world champion representing Sweden. Aregawi has successfully transferred her talents to the marathon and made headlines earlier this year by setting a Swedish national record of 2:23:12 on her debut. Her presence adds another intriguing dimension to an already high-quality field.

Amsterdam’s marathon course has consistently provided an opportunity for elite athletes to produce fast times, and this year’s women’s lineup has the depth to turn the race into a genuine test of both championship racing and outright speed.

With four athletes already inside 2:20, two former Amsterdam champions returning to the start line and several other accomplished marathoners ready to challenge them, the battle is expected to remain open deep into the race.

The ultimate target will be the Amsterdam women’s course record of 2:16:52. Whether the leading contenders can threaten that mark remains to be seen, but the quality assembled for October 18 ensures that the record will be firmly in the spotlight when the race reaches its spectacular finish inside the Olympic Stadium.

The 2026 Valencia Half Marathon is shaping up to be a thrilling contest of speed, endurance and tactical brilliance, with some of the world’s finest road runners set to converge in Spain on October 25.

Kenya’s Daniel Ebenyo and Alex Matata will be among the leading contenders, facing a formidable Ethiopian challenge spearheaded by Jemal Yimer and Tadese Worku. The field also features Rodrigue Kwizera, who boasts the fastest personal best among the leading entrants at 58:16.

Ebenyo arrives with a personal best of 59:04, placing him firmly among the athletes capable of sustaining a demanding pace over the 21.1-kilometre distance. Matata, who owns a 59:11 best, adds further Kenyan strength, while Andrea Kiptoo brings another sub-60-minute credential to the race.

Yimer has already established himself as one of the fastest athletes in the field with a 58:33 personal best, while Worku has clocked 58:35. Kenya’s Owen Korir, with a best of 58:58, further underlines the remarkable depth of the men's lineup.

Valencia Half Marathon 2026 Entries

1. Rodrigue Kwizera (Spain) — 58:16

2. Jemal Yimer (Ethiopia) — 58:33

3. Tadese Worku (Ethiopia) — 58:35

4. Owen Korir (Kenya) — 58:58

5. Daniel Ebenyo (Kenya) — 59:04

6. Alex Matata (Kenya) — 59:11

7. Andrea Kiptoo (Kenya) — 59:11

8. Thierry Ndikumwenayo (Spain) — 59:42

9. Said Mechaal (Spain) — 1:00:24

10. Adel Mechaal (Spain) — 1:02:30

Kwizera, who finished second in Valencia last year, leads the field on paper and will be seeking another standout performance on the famously fast Valencia course. With several athletes carrying sub-60-minute credentials, the race has the ingredients for an aggressive battle from the opening kilometres.

Beyond the headline names, the men’s field is deep and highly competitive, bringing together a strong collection of experienced international athletes with proven ability over the half-marathon distance. With so much quality packed into the lineup, the race promises an intriguing battle in which tactics, endurance, positioning and finishing speed could all play a crucial role in determining the eventual champion.

Yet personal bests will count for little once the gun goes off. The title could ultimately be decided by patience, positioning and the ability to respond when the pace begins to rise in the closing stages. Every surge, every tactical move and every second saved could prove decisive on the road to the finish.

With Kenya, Ethiopia and Spain represented by athletes of exceptional quality, Valencia promises a high-octane men's showdown in which the leaders are likely to be separated by only a handful of seconds. The final kilometres could provide the defining moments of a race packed with speed, ambition and anticipation.

On October 25, the question will be simple: who has the strength to command the streets of Valencia and claim the coveted half-marathon crown?

April 19, 1982. The Boston Marathon unfolded under unusually warm, sunny conditions, and by the closing stages, the race had become a private battle between two very different American runners: Alberto Salazar, already one of the biggest names in distance running, and Dick Beardsley, the Minnesota runner who had emerged as a serious marathon contender.

For roughly nine miles, from the Newton Hills toward the finish, Beardsley did much of the leading, with Salazar tucked close behind. Neither man could shake the other. They ran deep into Boston locked together, trading surges and refusing to surrender an inch as the crowds along the course grew louder.

Salazar finally made his decisive move with less than a mile remaining. He opened a small gap, but Beardsley refused to disappear. The Minnesota runner chased him through the final streets, closing again as they approached the finish.

Then came the final sprint.

Salazar held his form and reached the finish first in 2:08:52, with Beardsley only two seconds behind in 2:08:54. It was an extraordinary result: both men broke 2:09 in the same Boston Marathon, and both shattered the previous course record.

The race became known as the “Duel in the Sun,” and it remains one of the most celebrated head-to-head battles in Boston Marathon history. Beardsley had not won, but his performance established him as one of America's elite marathoners.

For Salazar, however, victory came at an enormous physical cost. Immediately after crossing the finish line, he collapsed and required emergency treatment, including several litres of intravenous saline. The combination of heat, dehydration and an all-out effort had pushed his body to the limit.

Salazar's marathon career would never again produce quite the same kind of performance. His celebrated 1981 New York City Marathon victory had produced what was initially considered a world record, although the course was later found to be short. His Boston triumph therefore became one of the defining victories of his career.

Beardsley's story would take an even more difficult turn. Injuries disrupted his career, and after returning to the highest level, he suffered a devastating farm accident in 1989. Further accidents, surgeries and severe physical pain followed, eventually leading to a long battle with painkiller addiction.

He eventually overcame that struggle and transformed the darkest chapters of his life into a story of recovery, resilience and redemption.

That is what makes the 1982 Boston Marathon more than a two-second victory.

For one extraordinary afternoon, Salazar and Beardsley produced a marathon duel in which neither man was willing to give way. One crossed the finish line first. The other finished only two seconds behind him.

Two seconds separated them at Boston. Decades later, their legendary duel remains one of the greatest chapters in marathon history.