Running News Daily

Ah, summertime! It's one of the best seasons for long trail runs, but it's also the hottest and one of the most difficult times to train.  

As temperatures and UV indices climb, runners in many regions can feel the dew point explode, and that can make it seem like any semblance of fitness gained over the winter and spring is suddenly gone. We can all recall an early summer run that makes us not only question our confidence, but whether we're going to make it through the next few months.

There are notoriously warm races on the horizon, and there's a lot of talk about heat and how to mitigate it: sauna training, layering, topical cooling-all the tools to get amateur and elite athletes alike through challenging conditions. Many of the runners who just raced the Western States 100 had relied on mid-afternoon runs when temperatures were at their highest, as well as sauna or hot water immersion training. The race, as with many other summer and early fall races, typically boasts soaring high temperatures along sections at lower elevations.

For decades, the three most-watched sporting events worldwide-the Summer Olympics, FIFA World Cup, and the Tour de France-are typically held during the hot summer months of the Northern Hemisphere. However, prior to 2012, most of the scientific literature on heat acclimation for athletes was based on laboratory testing and controlled environments, and not from real competitions in scorching conditions. With eight of the hottest years in recorded human history having been logged since 2015, global sport organizations such as the International Olympic Committee have finally placed enormous emphasis on providing up-to-date guidelines and recommendations in order to keep athletes safe.

The COVID-19-delayed Tokyo Olympics in 2021 were the hottest Games in modern history with temperatures soaring into the mid-80s and humidity hovering at 82 percent during the women's marathon. The good news is that it sparked considerable discussion and hypothesizing in sport-science communities about best ways for the athletes and their teams to prepare and endure heat. Ultrarunners everywhere watched as the world's best distance runners implemented topical cooling techniques such as pre-competition ice vests and bags of ice during the marathon-a relatively new or at least a more aggressive tactic to attenuate the impact of heat before and during competition.

Heat is considered an equalizer, an element that everyone has to manage, no matter if you're attempting to train or race through it. But does it have to be a performance-sapping equalizer? Can heat training (potentially year round) be viewed as an opportunity to improve fitness, tolerance, and mental strength for challenging race day conditions?

How Heat Impacts Performance

First up, let's discuss what happens when athletes exercise in the heat. Blood flow to the skin, as well as sweat rate, increase to promote heat dissipation. While aimed at keeping the human body safe, these processes increase physiological strain and the chance for dehydration in prolonged endurance events, leading to a subsequent increase in cardiovascular strain. This creates a chain reaction that negatively impacts aerobic performance. Researchers globally agree that the most salient way to lessen the strain that heat imposes is to perform a heat acclimation period ahead of race day.

Improvements in aerobic performance and thermal comfort achieved through heat acclimation are bolstered by these processes, as outlined in a 2011 scientific article from the U.S. Army Research Institute of Environmental Medicine.

Heat Acclimation

Let's dive even further into what the science says about heat acclimation, when and how to implement it, and what athletes of all levels can do to mitigate heat stress before, during, and after exposure to a hot endurance event.

A study published in the British Journal of Sports Medicine in 2015 provided the first-of-its-kind, gold-standard consensus recommendations for heat acclimation, and remains one of the most cited pieces of recent literature regarding training and competing in heat, along with Julien Periard's comprehensive review from 2021 for the American Physiological Society. In both reviews, the authors discuss heat acclimation, hydration, and cooling strategies as the pillars of successfully competing in the heat.

The authors report that most adaptations happen within the first week and more slowly within the following ten days. In order to achieve near complete adaptations to fully optimize aerobic performance, athletes need to plan for two weeks of focused acclimation. A pre-Tokyo Olympics study from 2020 suggests following the gold standard of 10-14 days of long-term heat acclimation followed by a shorter five-day reacclimation period just ahead of competition (during the taper period) in order to get the most out of "peak weeks" of training without compromising the health of the athlete with the added stressor of heat training.

It is important to note that the average loss of heat acclimation is roughly two-point-five percent per day following 48 hours without exposure to heat. But reacclimation happens quickly. The rate of decline varies from individual to individual and typically occurs at a slower rate than induction to heat acclimation.

The literature favors training in the same environment as the upcoming race, and if that isn't possible, training indoors in a heated room is the next best option. These once-a-day sessions should last at least 60 minutes, at an easy effort, while keeping a close eye on heart rate (preferably at about 75 percent of max heart rate). Athletes should expect to see their heart rate decrease as adaptations continue to occur, and as such, the duration or intensity of the session should be increased in order to maintain the training stimulus.

What if you don't have access to the same outdoor environment nor the set-up to train in a heated room? A study from 2007 demonstrated that 12 sessions of post-exercise sauna bathing at approximately 190 degrees Fahrenheit for 30 minutes at a time over the course of three weeks enhanced endurance performance.

What about dry heat versus humid heat and acclimating to either? The science demonstrates that acclimating to dry heat improves exercise in humid heat and vice versa. But acclimating in humid heat evokes higher skin temperatures and circulatory adaptations. In other words, the stereotypical dad statement: "But it's a dry heat!" holds somewhat true.

Are there benefits to heat acclimation when your race is in temperate or cool environments? A study from 2010 on cycling performance demonstrated a five percent increase in VO2max in cool conditions versus an eight percent increase in hot; a six percent improvement in time-trial performance in cool conditions vs. an eight percent improvement in hot; and an equal increase in power output at lactate threshold in both cool and hot conditions of five percent.

Hydration

Training in hot conditions increases sweat rate, which leads to progressive dehydration (if fluid intake is not increased), causing a similar cascading effect that is essentially the reverse of what happens during heat acclimation: decrease in plasma volume, evaporative heat loss, and cardiac filling all leading to a reduction in capacity to tolerate the effort in the heat.

A 2015 study in the British Journal of Sports Medicine underscores the importance of starting training or competition in the heat in a well-hydrated state with sodium supplementation before and during the event, minimizing body water mass losses during prolonged exercise in the heat, and being sure recovery hydration regimens include sodium, carbohydrates, and protein.

A 2010 study published in the Journal of Applied Physiology demonstrated enhancement and acceleration of heat adaptations, as well as further increases in blood plasma volume by taking in a protein-carbohydrate mix (0.3g of protein/kg of body weight and 3.6kcal of carbohydrate/kg of body weight) within 10 minutes of heat training.

Cooling Strategies

Numerous studies underscore that cooling strategies implemented immediately before, during, or after competition should be used in addition to heat acclimation, not as substitutes. Cooling strategies provide the most benefit during sustained exercise, but should not be used for sprinters. They include both external methods like ice bandanas and saturated towels, cold water immersion, fanning, topical menthol sprays, and internal options such as the ingestion of cold fluids or ice slurries. (Did someone say post-run slushies?!)

Ice bandanas and saturated towels demonstrate the ability to lower skin temperature (without lowering muscle temperature and risking injury) and effectively lower cardiovascular strain. Ice slurries have been shown to be more effective at cooling athletes than cold fluid ingestion, as the latter has also shown reductions in sweating and evaporation. The literature encourages combining techniques (external and internal), as doing so has a higher cooling capacity than the same techniques used in isolation.

A meta-analysis from 2020 found that topical menthol spray caused cooler thermal sensation and improved thermal comfort, but no significant differences in sweat production, core temperature, or heart rate were demonstrated. Findings showed external application, warmer environment, and higher body mass indices as improving menthol's effects on endurance performance without compromising the body's response to the heat.

How to Apply This in Training?

For athletes targeting a warm or hot race, we have a few options in how to structure heat acclimation. As a coach, I recommend against adding in heat acclimation as a novel stimulus without an anticipated hot race on the calendar, because most athletes still have a lot of other low-hanging fruit to grab first. (Looking at you, quality sleep!). If you are a highly trained athlete, chat with your coach prior to initiating heat acclimation in the absence of a warm-weather event on your schedule.

If you have a history of RED-S (Relative Energy Deficiency In Sport), work closely with your coach and medical team to be absolutely certain you aren't adding in too much stress to your training all at once. Taking body weight measurements can be a part of hydration monitoring, but it's important to contemplate the pros and cons of doing so. Another consideration is making sure you have a clear picture of your iron/ferritin status prior to initiating a robust heat acclimation protocol, as iron is lost through sweat.

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.