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Over the past decade, training for the heat has gone from a nice-to-have to an absolute necessity for top runners. Professor Chris Minson is attempting to perfect the science.

After a few pleasant hours sitting in the sun watching the Prefontaine Classic in Eugene, Oregon last month, I headed down into the bowels of Hayward Field for a grueling test for running in the heat. Chris Minson, a professor of human physiology at the University of Oregon, had invited me to try the heat adaptation protocol he has developed for elite athletes from the university and from local pro teams like the Bowerman Track Club. I’ve written about Minson’s research several times, so experiencing the protocol first-hand seemed like a good idea… at the time.

Heat is a big deal in sports these days, and it’s only getting bigger. In recent years we’ve had major events like the world track and field championships in insanely hot places, like Qatar, where the marathons had to be started at midnight. But summertime in Eugene (where the Olympic Track Trials will take place later this month) and Paris (where the Olympics will be held) can also be sizzling. Over the past decade, heat preparation has gone from a nice-to-have to an absolute necessity for top athletes. The details of how to prepare remain more art than science, though, so I was interested to see how Minson put theory into practice.

Back in the 1920s and 1930s, scientists developed the first heat adaptation protocols for workers in South Africa’s sweltering gold mines. The gold standard for heat adaptation evolved from that work: spend at least an hour a day exercising in hot conditions, and after 10 to 14 days you’ll see a bunch of physiological changes. Your core temperature will be lower, your blood volume will be higher, you’ll begin sweating and dilating your blood vessels at a lower temperature threshold, you’ll sweat more, and so on. Put it all together and you’ll be able to stay cooler and run faster in hot conditions.

In fact, there’s even evidence that this type of heat adaptation can make you faster in moderate weather, perhaps as a result of the extra blood plasma. In the lead-up to the 2008 Olympics, Minson was working with American marathoner Dathan Ritzenhein, helping him prepare for the expected hot conditions in Beijing. But he started to worry about what would happen if it wasn’t hot: would all the heat training actually make Ritzenhein slower? Minson and his colleagues ran a study to find out; the results, which they published in 2010, suggested that heat adaptation helps even in cool conditions. That’s the study that really kicked interest in heat training into higher gear.

The problem with the classic approach, though, is that training for an hour in hot, muggy conditions is exhausting. If you’re trying to do a hard workout, you won’t be able to hit the splits you want. If you’re trying to do an easy run, it’s going to take more out of you than it usually does, potentially compromising your next hard workout or raising your risk of overtraining. So how do you get the benefits of heat adaptation without tanking the rest of your training plan?

Minson’s Exercise & Environmental Physiology Lab at the University of Oregon, which he co-runs with fellow physiologist John Halliwill, is located in the Bowerman Sports Science Center, a state-of-the-art facility located under the northwest grandstand of Hayward Field. The key piece of equipment, for my purposes, is an environmental chamber that can take you down to 0 degrees Fahrenheit or up to 22,000 feet of simulated altitude, deliver simulated solar radiation, or blast you with wind. For my heat run, Minson set the dials to 100 degrees Fahrenheit and 40 percent humidity.

Earlier that day, Minson had given me a thermometer pill to swallow, which would enable him to wirelessly track my core temperature as the run progressed. “I’ll need that back,” he warned me, poker-faced. Fortunately, he was joking.

Before I entered the chamber, I peed in a cup so that Minson could check my urine-specific gravity, the ratio of how dense your urine is compared to water. I clocked in at 1.025, marginally above Minson’s threshold of 1.024 for mild dehydration. I blame it on having spent a few hours sitting in the sun watching the track meet. Then he checked my weight, so that he’d be able to figure out how much I sweated during the test.

When I stepped into the chamber, wearing nothing but shorts and running shoes, I could feel the blast of heat, but it wasn’t too oppressive—like a really hot day at the beach but under an umbrella. I started with a five-minute warm-up at a slow pace, gradually ramping up until I hit 7:30 mile pace. Then the formal protocol started: 30 minutes at that pace.

The pace was self-chosen; Minson refused to tell me the pace I “should” run. The goal was to settle in at an effort that I could comfortably maintain for half-an-hour, and that would get me hot enough to trigger adaptations—a core temperature of about 101 degrees Fahrenheit is thought to be about right—without overshooting and roasting myself. Most of the elite runners he works with end up choosing paces between 7:00 and 8:00 per mile. I slotted myself in the middle of that range—which, let’s be honest, was a dumb thing to do for an aging non-elite runner.

Still, the running itself felt easy to me. Every five minutes or so, Minson had me rate my perceived effort on the Borg scale, which runs from 6 to 20, and also rate how hot I felt. For this, he used his own 0 to 10 thermal scale.

I started out at the effort of 10 (“very light”) and thermal sensation of 3 (“warm”). After 15 minutes, my effort had crept up to 12 (“somewhat hard”), but my thermal sensation was still 3. By this point I was sweating up a storm, watching with interest as my splatters of sweat made a distinctly asymmetric pattern on the treadmill’s control panel. (Clearly I needed to visit the biomechanics lab down the hallway to sort out my stride asymmetries.)

In the latter part of the test, my sweat rate seemed to drop—not a great sign, since it could signal dehydration. My effort topped out at 13, but my thermal sensation crept up to 4 (“very warm”), then 5 (“slightly hot”), then 6 (“somewhat hot”). I still felt under control, though. Then the test ended, and Minson ushered me off the treadmill, into the next room, and into the hot tub, where he asked me to submerge myself up to my neck. The water was set to 104 degrees Fahrenheit, and it was awful. My thermal sensation immediately spiked up to 8 (“very hot”) and then 9 (“miserably hot”).

The odd thing is that the water was basically the same temperature as I was. My core temperature had crept up to 103.2 degrees towards the end of the run, and hit 103.7 shortly afterward. The water wasn’t warming me up in any significant way, but it was robbing me of the superficial perception of coolness that I got from air currents and the evaporation of sweat. It’s a good reminder of why cooling techniques like ice towels or simply dumping water on your head can be valuable: they can dramatically change your perception of how hot you are.

Sitting in that hot tub wasn’t fun, but it’s a key tool for Minson in his efforts to help athletes adapt to heat without interfering with their normal training. It extends the period of thermal stress without trashing their legs. A half-hour easy run, even in hot conditions, isn’t that draining for a well-trained athlete. At least, it’s not supposed to be.

After I’d had a cold shower and chugged a few bottles of sports drink, Minson went over the results with me. The good news is that I hadn’t seemed very bothered by the heat. I’d sweated out 2.2 pounds of fluid, indicating a fairly high sweat rate of around 2 liters per hour. That suggests that I should already be reasonably well equipped to race in warm conditions.

The bad news, though, was that my numbers didn’t make sense. There are no “wrong” answers on a subjective scale, but mine were puzzling. As the test proceeded and my core temperature drifted over 100 degrees, I kept claiming that I felt merely 3-out-of-10 “warm.” That might mean that I’m immune to heat—but more likely, it suggests that I wasn’t properly attuned to my body’s condition. If you’re running in the heat but you’re totally oblivious to how hot you’re getting, that can be a recipe for disaster.

In fact, my subjective numbers were strikingly similar to those of an elite runner Minson has worked with—one who has struggled in the heat. Minson helped the athlete renormalize his heat perception, so that conditions he originally labeled as 3 out of 10 became a more realistic 5 or 6 out of 10.

The ability to accurately gauge how hot you are is important even in training, because those core temperature pills are about $70 a pop. Once athletes have a sense of how hot they should feel during heat adaptation runs, Minson has them judge their half-hour efforts by feel. If they start getting too hot—above 7 on the Minson Scale—they can turn a fan on in the heat chamber to avoid overheating. There’s no rigid schedule of when they do these heat runs: they fit them in around their other training and racing and travel plans.

In practice, of course, most of us don’t have access to a high-tech heat chamber and temperature-controlled hot tub. But studies in recent years have shown that you can use a variety of approaches to get your core temperature up: hot baths, saunas (Minson has one in his lab, and another in his backyard), overdressing during runs. The big-picture takeaway from Minson’s approach is that you can find ways of getting a heat stimulus without disrupting the rest of your training.

To do that, though, you need to be able to gauge when you’re getting overcooked. When I got back to my hotel room that afternoon, I realized that I was feeling wrung out, as if I’d done a long, hard workout rather than a half-hour jog. I’d missed the mark. I decided to take the next day off, and dreamed that night of Minson’s other recent research focus: ice baths.

Ethiopia’s Fotyеn Tesfay Haylu delivered one of the most remarkable women’s half-marathon performances ever seen on American soil on Sunday, powering to a commanding victory at the 2026 Buenos Aires Half Marathon in Argentina in 1:03:57.

Running with exceptional confidence and strength, Tesfay took control of the race and produced a superb solo performance to rewrite the event record. Her breathtaking run also carried historic significance, as she became the first woman to break the 64-minute barrier for the half marathon in the Americas, producing what is being celebrated as the fastest women’s half-marathon performance ever recorded on the continent.

The Ethiopian star was in a class of her own, crossing the finish line more than a minute clear of Turkey’s Nevin Can, who finished second in 1:05:06. Another Turkish athlete, Selin Can, completed the podium in third place with 1:05:11, as the leading trio all produced strong performances on the fast streets of Buenos Aires.

Kenya also featured prominently in the top positions, with Irene Jepchumba Kimais taking fourth in 1:06:04, followed by Sheila Chepkirui in fifth with 1:06:13. Magaret Akidor Ngathike finished sixth in 1:06:46, while fellow Kenyan Deborah Samum claimed seventh place in 1:08:32.

Brazil’s Nubia de Oliveira Silva was eighth in 1:11:13, while Argentina’s Sofia Luna and Dahyana Juarez rounded out the top 10 with times of 1:11:21 and 1:11:28, respectively.

Top 10 Women – 2026 Buenos Aires Half Marathon

1. Fotyеn Tesfay Haylu (Ethiopia) – 1:03:57

2. Nevin Can (Turkey) – 1:05:06

3. Selin Can (Turkey) – 1:05:11

4. Irene Jepchumba Kimais (Kenya) – 1:06:04

5. Sheila Chepkirui (Kenya) – 1:06:13

6. Magaret Akidor Ngathike (Kenya) – 1:06:46

7. Deborah Samum (Kenya) – 1:08:32

8. Nubia de Oliveira Silva (Brazil) – 1:11:13

9. Sofia Luna (Argentina) – 1:11:21

10. Dahyana Juarez (Argentina) – 1:11:28

For Tesfay, it was far more than a race victory. Her 1:03:57 performance was a statement of extraordinary quality, combining speed, endurance and remarkable solo running to produce a landmark result in Buenos Aires. In a race that will be remembered for years to come, the Ethiopian did not simply win—she redefined what was thought possible for women’s half-marathon running in the Americas.

Ethiopia’s Yomif Kejelcha produced one of the most extraordinary performances in road racing history on the streets of Buenos Aires, Argentina, reclaiming the half marathon world record with a sensational 56:51 performance at the 2026 Buenos Aires Half Marathon.

The former world record-holder delivered a breathtaking exhibition of speed and endurance to take 29 seconds off the previous pending mark of 57:20, set by Uganda’s Jacob Kiplimo and takes a huge chunk from his own former official world record. Kejelcha's new performance is pending the standard ratification procedures, but if officially ratified, it will return the world record to the Ethiopian star and mark another remarkable chapter in the evolution of the event. 

Kejelcha's achievement is particularly significant because the 57-minute barrier had already been broken before. Jacob Kiplimo had previously run under 57 minutes, clocking 56:42 that was not ratified demonstrating that the once-unthinkable barrier was possible. Kejelcha, however, has become the second man to run under 57-minute barrier who now returns to the top of the all-time rankings with another historic performance in Buenos Aires.

The Ethiopian's race was remarkable not only for the final time but also for the way he built his performance. He covered the opening five kilometres in 13:44 before reaching 10km in 27:18. Rather than slowing, Kejelcha accelerated through the middle stages, passing 15km in 40:39 and 20km in 54:02 as he continued to push the limits of elite road racing.

By the time he reached the finish line, Kejelcha had completed the race at an extraordinary average pace of approximately 2:42 per kilometre, producing one of the most astonishing sustained efforts ever witnessed in distance running. His stunning run sent a powerful message to the athletics world and further strengthened his status as one of the most formidable distance runners of his generation.

Behind the record-breaking champion, Ethiopia completed a dominant clean sweep of the men's podium. Tadese Worku Gebresilase claimed second place in 59:18, while Bereket Nega Batebo secured third in 1:00:17, giving Ethiopia a memorable one-two-three finish in the Argentine capital.

Kenya’s Jonathan Kipkoech Kamosong finished fourth in 1:00:20, followed by compatriot Simon Maywa in fifth with 1:00:55. Argentina’s Ignacio Erario gave the home supporters plenty to celebrate with an impressive sixth-place finish in 1:00:57, breaking the one-hour barrier in front of an enthusiastic local crowd.

Dillon Kipyeko of Kenya finished seventh in 1:01:07, with Robert Kiprop Koech eighth in 1:02:01. Mexico’s Julio Ortiz Ponce took ninth place in 1:03:17, while Colombia’s Jimmy Gómez completed the top 10 in 1:03:34.

The Buenos Aires Half Marathon will now take its place in the history books as the scene of a truly extraordinary breakthrough. For Kejelcha, this was more than just another victory. It was a spectacular return to the top, reclaiming a world record he had previously held and once again rewriting the limits of the half marathon.

The 56:51 performance remains pending ratification, but Yomif Kejelcha's run has already delivered one of the defining moments in the history of road racing.

Kenya delivered another commanding display of distance-running excellence at the Antrim Coast Half Marathon, with Isaia Lasoi leading a memorable Kenyan clean sweep of the men's podium in a race packed with world-class performances.

Lasoi emerged victorious after a thrilling battle at the front, crossing the finish line in a superb 58:26 setting a new course record. His winning performance underlined his strength and speed over the half-marathon distance, but he was made to work all the way by fellow Kenyan Daniel Mateiko, who finished just three seconds behind in 58:29 after an electrifying duel for the title.

The contest between the two leaders produced one of the standout moments of the race, with both athletes pushing deep into elite territory as they fought for victory. In the end, Lasoi found just enough to secure the win, while Mateiko's narrow defeat highlighted the remarkable depth and quality of Kenya's leading distance runners.

Vincent Kipkorir completed the Kenyan sweep, taking third place in 1:00:38 to ensure that all three places on the podium belonged to Kenyan athletes. Samwel Chebolei added further Kenyan strength to the results, finishing fourth in 1:01:01, while Amos Langat was also among the leading finishers.

The international field featured several prominent names. Australia's Jimmy Whelan produced a strong run, while Ethiopia's Yismaw Dillu featured among the front group. American marathon star Galen Rupp also delivered a notable performance, clocking 1:01:29 in another competitive outing for the experienced distance runner. Former world-class track and road athlete Edward Cheserek was also among the top finishers.

Lasoi's 58:26 victory, however, was the defining performance of the day. Together with Mateiko and Kipkorir, he gave Kenya a perfect podium and another emphatic reminder of the country's extraordinary strength in elite road running.

The Antrim Coast Half Marathon once again provided a fast, competitive stage for some of the world's finest distance runners, but when the decisive moments arrived, it was Kenya that owned the podium.

One of the most iconic milestones in the history of ultramarathon running is drawing closer, with entries for the historic 100th edition of the Comrades Marathon set to open on Tuesday, 25 August 2026.

The Comrades Marathon Association has officially announced a detailed entry process for the 2027 race, which will unfold in three stages and give runners around the world the opportunity to secure their place in what promises to be one of the most significant editions ever held of The Ultimate Human Race.

The announcement followed the official launch of the 2027 Comrades Marathon on Wednesday, 19 August, when the centenary campaign, “The Greatest Story Ever Run,” was unveiled alongside a special logo created exclusively for the landmark 100th edition.

The launch also revealed several major highlights for the Centenary Race. The historic event will take place on Sunday, 13 June 2027, and will be a Down Run, with 28,000 places available. The entry process will include a ballot, while the race will offer a record R8.919 million in prize money. Organisers have also set an ambitious goal of raising R10 million for the Amabeadibeadi charities, adding an important charitable dimension to the centenary celebrations. One of the defining moments of the launch was the unveiling of the special Centenary mark, created to commemorate this extraordinary milestone in the history of the race.

The entry process begins on 25 August at 10:00 a.m. SAST, when entries open for Green Number runners, Yellow Number runners and Amabeadibeadi charity entrants.

The next phase follows on 2 September at 10:00 a.m. SAST, when entries open for Comrades Marathon Association members. This window will remain open for 72 hours or until the available entry allocation is filled, with places offered on a strictly first-come, first-served basis.

For general entrants, the process will move to a ballot system. General entries open on 9 September at 10:00 a.m. SAST, with runners able to enter the ballot until it closes on 22 September at 4:30 p.m. SAST. The ballot draw is then scheduled to take place on 23 September.

Several other crucial dates will shape the road to the historic race. The substitution period will run from 15 to 31 March 2027, while 3 May 2027 is the final deadline for runners to submit their qualifying performances, seeding information and other required entry details.

To qualify for the 2027 Comrades Marathon, runners must complete a 42.2km marathon in under five hours between 15 June 2026 and 3 May 2027.

The journey will finally culminate on Sunday, 13 June 2027, when thousands of runners are expected to line up for the historic 100th edition of the Comrades Marathon.

The 2027 race will represent a remarkable moment for the legendary South African ultramarathon. For more than a century, the Comrades Marathon has captured the imagination of runners and spectators with its extraordinary test of endurance, determination and human spirit. Its centenary edition will celebrate the generations of athletes who have faced its demanding roads, conquered its challenges and helped build one of the world's most respected endurance events.

For runners dreaming of becoming part of this historic occasion, the road to Comrades 2027 is now clearly marked. From the opening of entries in August 2026 to race day in June 2027, every deadline will matter.

The Greatest Story Ever Run is preparing for its most historic chapter yet.

American sprint standout Sam Blaskowski is taking steps toward an international future with Poland after uncovering a powerful connection to his family's ancestral homeland.

The 23-year-old sprinter, who has established himself as one of the fastest Americans of his generation with a personal best of 9.89 seconds in the 100 metres, has begun the process of obtaining Polish citizenship with the aim of eventually representing Poland in international competition.

Blaskowski's connection to the country traces back through his great-grandparents, Franciszek and Julian Błaszkowski, who emigrated from Poland to the United States in 1905. Their journey more than a century ago has now opened an unexpected new chapter for their descendant, whose athletic ambitions could soon carry the Błaszkowski name back onto the international stage under Polish colours.

The sprinter has already received support from the Polish Athletics Association as he works through the citizenship and eligibility process. Should his transfer of allegiance be completed, Blaskowski could become a significant addition to Poland's sprint programme.

His credentials certainly make the prospect an exciting one. In addition to his sub-10-second speed over 100 metres, Blaskowski owns a personal best of 19.93 seconds in the 200 metres, demonstrating the kind of versatility that could prove valuable both individually and in Poland's 4x100m relay squad.

For Blaskowski, however, the move is about more than simply changing national colours. It represents an opportunity to reconnect with his family's heritage while pursuing his ambitions at the highest level of the sport.

With his sights set on becoming part of Poland's international sprint team and competing for relay medals, Blaskowski's journey from discovering his Polish roots to potentially representing the country of his ancestors could become one of the most fascinating allegiance stories in world athletics.

A century after Franciszek and Julian Błaszkowski left Poland for America, their family's story may now be coming full circle—this time at full sprint.