Running News Daily

The gel lowers perceived heat stress, which could improve performance in warm weather.

In research to be published in the International Journal of Sport Nutrition and Exercise Metabolism, athletes who took a menthol gel during a workout in warm conditions reported feeling cooler.

Study participants also reported feeling less airway constriction and that they could breathe more freely.

This supports the growing evidence that there could be natural performance-enhancing benefits to different types of tastes when you’re working out or competing.

As we reported last year, there’s growing evidence for the performance-enhancing benefits of various tastes, independent of whatever energy the food or drink they’re in provides. That’s true for some of the most common forms—sweet, bitter, spicy, cooling—of what researchers call “tastants.”

A barrier to everyday athletes making use of this phenomenon is a dearth of commercially available sport nutrition products containing one of these tastants. So, for example, if you’re inspired by the study in which runners improved their 1500-meter time after taking a capsule containing capsaicin, the chemical that gives chili peppers their heat, you’ll have to come up with a DIY solution, such as swilling diluted hot sauce.

There might soon, however, be an easy-to-use option for people wanting to capitalize on research showing improved performance in the heat after athletes ingest menthol taste solutions. GU Energy Labs is developing a mint-flavored menthol gel that, in research to be published in the International Journal of Sport Nutrition and Exercise Metabolism, imparted a significant cooling sensation when taken during warm-weather training. The basic idea is that such a gel could make exercising in the heat feel more comfortable, and thereby encourage athletes to go faster or longer.

For the study, 40 national- or world-class endurance athletes consumed a gel on three separate workouts done in average conditions of 78 degrees Fahrenheit and 56 percent relative humidity. The participants were split evenly between men and women; 19 were cyclists, 15 were race walkers, and six were runners. During one workout, they downed a gel with a menthol concentration of 0.5 percent, during another they had a gel with a menthol concentration of 0.1 percent, and during the third they consumed a mint-flavored placebo gel that contained no menthol.

Both of the menthol gels imparted a cooling sensation, while the placebo didn’t. Participants reported feeling cooler for two to 15 minutes after taking the lower-concentration menthol gel, and for up to 45 minutes after using the higher-concentration one. However, half of the athletes said the cooling sensation was too intense after the higher-concentration gel. The lower-concentration gel received a better overall rating on the confluence of cooling, mint flavor intensity, and sweetness. That’s the one that Gu is continuing to develop in collaboration with Southern Cross University in Australia.

How does this phenomenon work?

“The chemical compound in menthol activates receptors linked to temperature-sensing neurons that send your brain information about the presence of cold stimuli,” Roxanne Vogel, who developed the gel as the focus of her Ph.D. research, told Runner’s World. “Essentially, menthol ‘turns on’ the same messaging pathway that responds to cold, so you get the sensation of cooling without any actual change in temperature.” 


Many of the study participants also reported feeling less airway constriction, and that drinks tasted colder, after they consumed the menthol gels. Cold/menthol receptors in the upper respiratory tract “can provide a sensation of increased ventilation,” Vogel said. “This is why menthol is commonly used in medicinal chest rubs and cough drops.”


Vogel’s explanation meshes with my own individual experience taking the lower-concentration menthol gel during a few long runs. The cooling sensation was more or less immediate, and strong. (Whether I needed a cooling sensation during winter in Maine is another matter, but duty calls.) I also felt I could breathe more freely. The latter sensation can’t be ascribed to the power of suggestion, because I hadn’t yet read the full study text in which participants reported the same feeling.

I’m now saving my remaining prototypes for this summer, to use them in their intended conditions. When I do so, I’ll be sure to remember a caveat noted in Klein’s quote above and in other research on the topic: Don’t confuse the feeling of being cooler with actually being cooler. Again, menthol lowers your perception of warmth, but doesn’t affect your core temperature, which will rise when you run in hot weather.

Gu is planning real-world field testing of the menthol gel this summer to help decide the product’s release date , according to Magdalena Lewy Boulet, the Olympic marathoner and Western States 100 champion who is the company’s senior vice president of innovation, research, and development.

After years of battling injury and uncertainty, Jake Heyward is proving that resilience can be just as powerful as raw talent. The Welsh middle-distance star has announced his return to the sport in emphatic fashion, producing the performance of his career and emerging as one of the athletes to watch in the men's mile at the upcoming Commonwealth Games.

At the London Diamond League, Heyward delivered a sensational run, finishing as the second-fastest British athlete behind mile world record-holder Josh Kerr. His time of 3:46.73 not only established a new Welsh record but also elevated him to third on the United Kingdom's all-time mile rankings, trailing only Kerr and British legend Steve Cram.

For many athletes, such a breakthrough would simply mark another career milestone. For Heyward, however, it represents the culmination of an extraordinary journey back from one of the toughest periods of his life.

The 26-year-old revealed that before undergoing surgery, he had been competing while suffering from Haglund's deformity, a painful condition affecting the heel that placed constant strain on both Achilles tendons. The problem eventually led to a devastating double Achilles injury, forcing him away from competition for an astonishing 20 months.

Rather than allowing the setback to define him, Heyward used the prolonged rehabilitation to rebuild both physically and mentally. Reflecting on that difficult chapter, he believes the experience has transformed his outlook on the sport.

"I truly believe that, because I've gone through this experience and I've had to ask myself certain questions, I actually understand the sport more. In terms of expectations and times, I'm super excited. I think there's no limit on what I can achieve. Running for Wales once again is a huge motivation."

Those words now carry even greater weight after his record-breaking performance in London.

Heyward's resurgence has injected fresh excitement into British middle-distance running and has positioned him as a genuine contender heading into Glasgow. With renewed confidence, a healthier body, and a deeper appreciation of the sport forged through adversity, he appears ready to challenge the world's best once again.

His journey from nearly two years on the sidelines to becoming Wales' fastest-ever miler is a powerful reminder that some of the greatest victories are earned long before the finish line. If his recent form is any indication, Jake Heyward's comeback story may only be just beginning, and the Commonwealth Games could provide the perfect stage for its next unforgettable chapter.

Australian sprint sensation Torrie Lewis continues to redefine the limits of her remarkable young career after storming to a stunning 11.04 seconds in the women's 100 metres at the TIPOS P-T-S Meeting in Slovakia, setting a new Australian record in breathtaking fashion.

Lewis sliced 0.04 seconds off her own previous national record of 11.08, producing the fastest performance ever by an Australian woman over the distance. Her blistering run confirmed that her rise is no fleeting moment—it is the arrival of one of the world's most exciting sprint talents.

The race itself was a spectacle from start to finish. Lewis exploded from the blocks, held her composure through the drive phase, and unleashed a powerful finish to edge one of the greatest sprinters in history, Elaine Thompson-Herah of Jamaica, who crossed the line in 11.06. Austria's Christania Williams also clocked 11.06, making it one of the most fiercely contested 100-metre races of the meeting.

Beyond the victory, the performance carries even greater significance. Lowering a national record is never easy, especially after already establishing yourself as the country's fastest woman. Yet Lewis demonstrated that she is still finding new levels, delivering a performance that signals she is becoming an increasingly serious contender on the international stage.

The 11.04 clocking is another milestone in a season that continues to gather momentum. With every race, Lewis is proving she possesses not only exceptional speed but also the consistency and composure needed to challenge the world's elite when the stakes are highest.

As global championship season approaches, Australia's sprint star has sent a powerful message to her rivals. If this latest record-breaking performance is any indication, Torrie Lewis is only beginning to reveal the full extent of her potential, and the fastest chapters of her career may still lie ahead.

Some moments in sport transcend generations. They remind us that while records may fall, the spirit of greatness never fades. One such moment unfolded when legendary New Zealand coach Arch Jelley watched Josh Kerr produce a breathtaking 3:42.66 mile world record—not from the stands, but from his bed, sharing the historic occasion with his former athlete, 1988 Olympian Christine Pfitzinger, herself once New Zealand's mile and 1500m record holder.

For most fans, Kerr's astonishing performance was simply another unforgettable chapter in the evolution of middle-distance running. For Jelley, however, it was something far more profound. It was a bridge between two eras separated by more than half a century, connecting the glorious past he helped shape with the remarkable future he lived long enough to witness.

As he approaches his 104th birthday on August 13, Jelley has seen the mile transformed in ways few people ever will. Long before modern technology, advanced sports science and super shoes reshaped the event, he guided one of athletics' greatest pioneers.

On August 12, 1975, in Gothenburg, Sweden, Jelley coached Sir John Walker to a revolutionary 3:49.4, making him the first man in history to break the seemingly impossible 3:50 barrier for the mile. It was a performance that changed the sport forever and cemented Walker's place among the all-time greats. Less than a year later, Walker crowned that success by winning the Olympic 1500m gold medal at the 1976 Montreal Games, fulfilling the promise of one of the finest coach-athlete partnerships athletics has ever known.

Yet Walker was only one chapter in Jelley's extraordinary coaching legacy.

Across more than six decades, the master coach nurtured and inspired countless elite middle- and long-distance runners, earning a reputation for developing athletes through patience, wisdom and an unwavering belief in their potential. Even retirement could not keep him away from the sport he loved. At the remarkable age of 93, Jelley returned to coaching to help Hamish Carson qualify for the 2016 Rio Olympic Games, proving that passion for excellence has no expiration date.

Now, more than fifty years after witnessing Walker redefine what was possible, Jelley has watched another runner push the boundaries of human performance. Josh Kerr's magnificent 3:42.66 was not merely a new world record—it was another milestone in the endless pursuit of greatness, one observed by a man who has devoted almost an entire lifetime to that very journey.

There is something beautifully symbolic about the scene: a coach who once stood trackside guiding history now watching a new generation rewrite it through the lens of modern technology. The setting may have changed, but the emotion remains the same.

Few people in athletics can claim to have witnessed the evolution of the mile from the dawn of the sub-3:50 era to today's astonishing world-record performances. Arch Jelley can.

His life is more than a coaching story—it is a living timeline of the mile itself. From John Walker's historic breakthrough in 1975 to Josh Kerr's record-shattering masterpiece in 2026, Jelley has remained a constant witness to the relentless pursuit of human excellence, proving that while champions come and go, the love of the sport endures across every generation.

When Sir Roger Bannister crossed the finish line in Oxford on May 6, 1954, in 3:59.4, he did far more than become the first man to run a sub-four-minute mile. He demolished one of sport's greatest psychological barriers, proving that what had long been considered impossible was simply waiting for someone bold enough to achieve it.

More than seven decades later, that historic run remains the most famous mile ever raced—not because it is still the fastest, but because it transformed athletics forever. Bannister's achievement inspired generations of runners to dream bigger, train harder and believe that seemingly unreachable barriers could be broken.

Today, however, the mile has entered an entirely different dimension.

Josh Kerr's sensational 3:42.66 world record has redefined the limits of middle-distance running. In one unforgettable race, the Scottish star erased Hicham El Guerrouj's legendary 3:43.13 mark that had stood untouched since 1999, proving once again that every era has its athlete capable of rewriting history.

The numbers tell a remarkable story of progress. If Bannister's iconic 3:59.4 were placed in the same race as Kerr's 3:42.66, the man who first conquered the sub-four-minute barrier would finish almost 17 seconds behind. At the pace Kerr sustained, that deficit would amount to well over 100 metres—an extraordinary margin in an event where the world's best are often separated by hundredths of a second.

Yet those statistics should never be mistaken for a comparison of greatness. Bannister and Kerr competed in vastly different eras, under different conditions and with entirely different levels of sports science, training knowledge, footwear technology and track surfaces. Bannister raced on a cinder track wearing heavy leather spikes, balancing elite athletics with his demanding medical studies. Kerr benefits from decades of scientific advancement, world-class support systems and cutting-edge equipment that have helped athletes push the boundaries of human performance.

Every generation has added another chapter to the mile's extraordinary story. Just weeks after Bannister's breakthrough, Australia's John Landy lowered the record to 3:57.9. The baton then passed through legendary names including Derek Ibbotson, Herb Elliott, Peter Snell, Michel Jazy, Jim Ryun, Filbert Bayi, John Walker, Sebastian Coe, Steve Ovett, Steve Cram, Noureddine Morceli and Hicham El Guerrouj. Each champion dared to believe the record could fall again, leaving the event stronger than they found it.

Josh Kerr is now the latest custodian of that legacy. His world record is not simply another fast time—it is the culmination of more than 80 years of relentless progress. Every stride he took was built upon the courage, ambition and achievements of those who came before him.

Perhaps the most fascinating aspect of the mile is how dramatically its meaning has changed. In 1954, the world was captivated by one question: Could anyone ever run under four minutes? Today, the conversation has shifted to how much further the event can evolve. With Kerr already under 3:43, the now-unthinkable prospect of a sub 3:42 mile no longer feels like fantasy but a genuine possibility for the future.

That is the enduring beauty of athletics. Every world record eventually falls, but the performances that redefine belief never fade. Bannister's sub-four-minute mile remains the sport's most iconic breakthrough because it changed the way humanity viewed its own limits. Kerr's 3:42.66 is the newest benchmark of excellence, standing as proof that the impossible is never permanent—it is simply the starting point for the next generation.

Josh Kerr has already etched his name into athletics history with a breathtaking world mile record of 3:42.66, but the numbers hidden within that extraordinary performance suggest an even greater achievement could be just around the corner.

While the world celebrated the fastest mile ever run, another remarkable statistic quietly emerged. On his way to that historic finish, Kerr passed the 1,500m mark in an astonishing 3:27.62—the seventh-fastest performance ever recorded over the distance and just 1.62 seconds outside Hicham El Guerrouj's iconic world record of 3:26.00, which has stood as one of athletics' greatest benchmarks for more than a quarter of a century.

What makes Kerr's split so extraordinary is the context in which it was achieved.

Unlike a dedicated 1,500m race, Kerr wasn't running to the finish line when he reached 1,500 metres. He still had another 109 metres remaining before completing the mile. Throughout the race, he had to carefully distribute his effort, knowing there was still significant work left after crossing the traditional 1,500m distance.

His world-record mile required approximately 724 strides, each averaging about 2.22 metres in length. By the time he reached the 1,500m split, he still had enough energy reserved to launch one final charge toward the mile finish, meaning he could not afford to completely exhaust himself at that point.

That reality has fuelled growing excitement across the athletics community.

Imagine Kerr lining up for a race built solely around the 1,500m. With elite pacemakers setting the perfect rhythm from the gun, competitors pushing the pace all the way to the finish, and no need to save anything for an additional 109 metres, the conditions would be dramatically different. Every stride, every surge and every ounce of energy could be devoted exclusively to chasing one target—the world record.

Many athletics experts believe that under those ideal circumstances, bridging the remaining 1.62 seconds is far from impossible. In fact, they see it as a realistic challenge for an athlete who has consistently demonstrated remarkable finishing speed, tactical intelligence and the ability to perform under immense pressure.

Hicham El Guerrouj's 3:26.00 has long been regarded as one of the most untouchable records in middle-distance running. Yet every era eventually produces an athlete capable of redefining what was once thought impossible.

After witnessing Kerr's astonishing mile masterpiece, the conversation has shifted dramatically. The question is no longer whether he belongs among the greatest milers in history—it is whether he can become the man who finally brings down one of the sport's most enduring world records.

If his latest performance is any indication, the countdown to another historic assault may already have begun.