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.

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.