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That’s 16 (!) times across the famous Dipsea trail—roughly 113 miles and nearly 38,000 feet of elevation gain.

The Dipsea trail in Marin County, California, is famous for its roughly 2,300-foot incline, rising straight up and then straight down over 7.1 miles from Mill Valley to Stinson Beach. Three races run across the trail every year—the Dipsea, the Double Dipsea (an out and back), and the Quad Dipsea (two out and backs, totaling 28.4 miles).

Yet, on record, only one person has ever completed the fabled Quad Quad Dipsea, which is 16 crossings of the trail (eight out and backs) for 113 miles and nearly 38,000 feet of elevation—8,000 feet more than the height of Mount Everest. That person was Don Lundell in 2003. Few have attempted the unofficial race since—until December, when Bradley Fenner became the second runner ever to complete the 16 crossings.

It was an idea sparked by Tony Marshall, a runner from the area. In the absence of races because of the pandemic, Marshall convinced Fenner, his friend and fellow area runner, to take on the challenge on the weekend that Quad Dipsea normally takes place.

Fenner, 56, knew the course well; he’s completed the Quad race 11 times since 2008 and runs on the trail frequently, since he lives nearby. But initially, he wasn’t keen on the idea, feeling nervous about the distance and elevation. Still, he began training and after a solid performance doing a Double Quad (eight out and backs) in mid-October, he decided to get on board.

“Over the years, when I would train with my friends for the Quad Dipsea, we jokingly made reference about doing the Quad Quad, but it never gained a lot of traction,” Fenner told Runner’s World. “I was incredibly and candidly intimidated by the statistics of it. I had never run quite that far. I’d done 100 milers. This was a bit further and involved 36,000 feet of elevation. I was intrigued by it. I was also intimidated by it.”


At 5 a.m. on December 4, Fenner and Marshall ascended the 670 stairs from Mill Valley for the first time, beginning what would be a long adventure lasting more than 30 hours. The duo had a two-person crew, Zak Sterling and Jim Lynch, stationed in Mill Valley and a lone parked car near the trail head in Stinson Beach with supplies if needed.

After about 43 miles, or five out-and-backs, Marshall called it a day because of a stomach issue, leaving Fenner to go the rest of the way on his own. To stay mentally strong, Fenner broke down the race into sections to be completed—eight out and backs was more digestible than 113 miles.

Luckily, he also lined up runners from the community like Charlie Ehm, Gary Wang, Olivia Amber, Jon de St. Paer, Corrine Malcolm, Ezra Becker, Devon Yanko, Louis Secreto, Hal Rosenberg, Greg Nacco, and Geoff Vaughan to crew and pace him over those tough stretches.

One of his biggest challenges was the lack of daylight hours of the winter. He started in the dark and only had, at most, 10 hours of light before night set in on the first day. It would be a long 14 hours at night, using his own lighting gear and his Hoka Evo Mafate 2s to tackle the difficult terrain.

“The downhills in the darkness were hard,” Fenner said. “The moon wasn’t close to full, so there wasn’t light from that. It was treacherous in the pitch black.”

Fenner simply kept to his routine. He did not sit down at any point for fear of the chair absorbing him. He hiked the uphills and jogged the downhills. He stuck to solid foods like egg sandwiches, turkey sandwiches, Coke, Ensure, cheese pizza, and cheese quesadillas, rather than things like gels or sports drinks he thought he’d get tired of over 30 hours.

After 31 hours, he had reached the final out and back of the trail. His quads and calves burned after over 30,000 feet of elevation, but he climbed the stairs one last time. Over the peak he went and back down leaving one more crossing to go.

“I was nervous and not taking anything for granted,” Fenner said. “There are portions of the trail that are so gosh-darn technical. You can role your ankle at any point. I just focused on where I was until the final mile where I finally thought I was going to finish. But I was kind of nervous that disaster could strike pretty much any time.”

As Fenner descended the stairs, he was greeted by the small crowd of his crew and friends who showered him with cheers and champagne. Fenner wasn’t a big fan of the latter after 113 miles, but he said he “was too tired to object and just let them pour it on me because I wasn’t sure if I could do anything.”

He quickly found a chair, finally sitting after 34 hours, 15 minute, and 35 seconds. A friend handed him a Fort Point Villager IPA and someone else brought him In-N-Out Burger. He called Quad Dipsea creator Tropical John Medinger, who congratulated him over FaceTime. 


Afterwards, he felt sore but not horribly so. He did feel a surprising amount of fatigue in for 10 to 14 days after, which he credits to the long, overnight effort throwing off his internal clock. A month out, he is back to full strength and he is proud of his accomplishment.

“I would ask that, whatever you write, please don’t use the word legend,” Fenner said. “I’m better than middle of the pack, but I’m not elite. I set a goal, I worked toward it, and I had a good day with phenomenal support. I’m not a legend. I’m not Rob Krar. I’m just a normal guy who loves the sport. I will say it was the most significant run that I have ever done, so I will at least say that.”

Most Olympic marathoners spend their youth focused on running. They join track clubs, compete in national championships, and pursue the sport from an early age.

Julia Mayer’s journey was very different.

Today, Mayer is Austria’s marathon record holder, a multiple national record holder on the roads, and an Olympian. Yet for much of her athletic life, running was not her primary sport.

For 16 years, she played soccer.

Then she discovered something that would change her life.

“I noticed that I was really fast in the fun runs and that it was really, really fun,” Mayer said when reflecting on her transition from soccer to distance running.

What began as curiosity quickly became a passion. She eventually made the bold decision to leave soccer behind and focus entirely on running. It was a move that surprised many people around her, but Mayer believed she had found her true athletic calling.

The decision proved to be the right one.

Within a few years, Mayer developed into one of Europe’s top marathon runners. Her steady improvement carried her from local races to the international stage, where she began rewriting Austria’s record books.

She now holds Austrian records in the marathon, half marathon, and road 10K. Her marathon best of 2:26:08 established her as the fastest female marathoner in Austrian history. Her performances in the half marathon and 10K have further cemented her place among the country’s all-time great distance runners.

Her rise culminated with qualification for the 2024 Olympic Games in Paris.

Competing in the Olympic marathon represented the realization of a dream. On one of the most challenging marathon courses ever used for the Olympics, Mayer ran courageously against the strongest field in the world and finished 55th in her Olympic debut.

Behind the scenes, success has come through extraordinary dedication. During marathon preparation, Mayer trains twice a day and covers approximately 200 kilometers, or 124 miles, each week. The workload demands discipline, patience, and a deep commitment to continuous improvement. 

What makes her story especially inspiring is not simply the records or the Olympic appearance.

It is the fact that she found her greatest talent later than many elite runners.

In a sport where athletes are often identified at a young age, Mayer’s journey serves as a reminder that potential does not always reveal itself early. Sometimes it takes years of experience, a willingness to try something new, and the courage to follow a different path. 

The former soccer player who once chased a ball across a field is now chasing history on the roads of Europe.

And according to those closest to her, her best performances may still be ahead.

For runners of every age and ability, Julia Mayer’s story delivers a powerful lesson: it is never too late to discover what you are capable of.

From soccer player to Olympian, her journey proves that remarkable achievements can begin when least expected.

Megan Keith produced the performance of her career in Oslo on Thursday night, shattering one of Scotland’s longest-standing distance running records and cementing her place among Britain’s greatest female 3000m runners.

The 24-year-old clocked a sensational 8:28.35 over 3000m, breaking the Scottish outdoor record that had stood for nearly four decades. In doing so, Keith eclipsed the previous mark of 8:29.02, set by Scottish legend Yvonne Murray back in 1988, ending a record reign that had lasted 38 years.

Keith’s breakthrough run was more than just a national record. The performance also propelled her to third on the UK outdoor all-time list, placing her behind only two of Britain’s most celebrated distance runners — Paula Radcliffe, who leads the rankings with 8:22.20, and Laura Weightman, whose 8:26.07 remains the second-fastest outdoor mark by a British woman.

The significance of Keith’s achievement is amplified by the calibre of athletes she now joins in the record books. For decades, Murray’s mark stood as one of Scottish athletics’ most untouchable records, surviving generations of elite competitors. Keith has now succeeded where many outstanding runners have fallen short, announcing herself as one of the leading distance talents in British athletics.

Her time also compares favourably with the best performances produced indoors. Olympic medallist Laura Muir ran 8:26.41 indoors in Karlsruhe in 2017, underlining just how exceptional Keith’s outdoor effort in Oslo truly was.

The run continues a remarkable rise for the Scottish star, whose progression over recent seasons has transformed her from a promising prospect into a genuine force on the international stage. Running with confidence and composure against elite competition, Keith demonstrated both the speed and endurance required to challenge the very best in Europe and beyond.

With the World Championship season gathering momentum, Keith’s record-breaking display sends a powerful message. Not only has she etched her name into Scottish athletics history, but she has also established herself as a serious contender in one of the sport’s most competitive events.

In Oslo, Megan Keith did far more than break a record. She ended a 38-year wait, climbed into the upper echelon of British distance running, and delivered a performance that may prove to be a defining moment in her career.

British middle-distance talent Phoebe Gill took another significant step forward in her return to top form, producing a determined victory over 800 metres at the Meeting de Marseille in France on Wednesday.

Competing in challenging, wind-affected conditions, the 19-year-old demonstrated both resilience and composure as she held off a late charge from Switzerland's Veronica Vancardo to secure the win in 2:00.81. Vancardo finished just three hundredths of a second behind in 2:00.84, underlining the fiercely contested nature of the race.

While the margin of victory was narrow, the result represented another encouraging milestone for Gill as she continues to rebuild momentum following her injury setback. The young Briton showed impressive race awareness and strength in the closing stages, maintaining her advantage despite the difficult conditions that made fast running a challenge throughout the evening.

The Marseille triumph adds to a growing body of evidence that Gill is steadily progressing toward her best form. Earlier in her comeback campaign, she clocked 2:01.50 for 800m in Bydgoszcz before demonstrating her versatility with a strong 4:05.53 performance over 1500 metres at the BMC Grand Prix meeting in Trafford.

Those performances have highlighted not only her improving fitness but also her ability to compete across multiple distances as she carefully builds her season. The Marseille victory now provides further confirmation that the European junior star is moving in the right direction.

Gill emerged as one of Britain's most exciting middle-distance prospects through a series of breakthrough performances as a teenager, earning widespread recognition for her fearless racing style and remarkable maturity. Injury temporarily interrupted that upward trajectory, but her recent results suggest she is steadily rediscovering the form that made her one of the sport's brightest young talents.

With each race, the signs of progress become increasingly evident. Winning in difficult conditions and under pressure from a quality field is often a stronger indicator than a fast time alone, and Gill's latest success demonstrated exactly those qualities.

As the summer season gathers pace, the Marseille victory offers another confidence boost for the British teenager, whose return continues to gain momentum. If her recent progression is any indication, Gill could soon find herself back among the leading names on the European middle-distance circuit. 

The NCAA Track and Field Championships delivered a moment few could have predicted as Ja’Kobe Tharp produced one of the most astonishing performances in the history of sprint hurdling, rewriting the record books in spectacular fashion.

Competing in the opening round of the men’s 110-meter hurdles, the Auburn star stunned the athletics world by clocking an incredible 12.75 seconds, becoming the first athlete ever to break the 12.80-second barrier. In doing so, he eclipsed the long-standing world record of 12.80 set by Aries Merritt in 2012, a mark that had stood as one of the sport’s most revered achievements for more than a decade.

What makes Tharp’s breakthrough even more remarkable is the scale of his improvement. Entering the championships, the defending NCAA and U.S. champion had recorded a season-best of 13.05 seconds. Yet under the brightest spotlight, he unleashed a performance that exceeded every expectation, slicing an extraordinary 0.26 seconds from his personal best in a race that instantly became one of the greatest ever run.

The achievement sent shockwaves throughout the track and field community. While Tharp arrived in Eugene as one of the leading contenders for the NCAA title, few envisioned a performance capable of redefining the limits of the event. Instead, the American hurdler delivered a race for the ages, combining flawless technique, explosive speed, and impeccable rhythm from the first hurdle to the finish line.

The historic run not only secured his place in athletics history but also transformed the outlook of the championship. With the world record now in his possession, Tharp advances to the final as the overwhelming favorite, carrying momentum that could make an already unforgettable weekend even more extraordinary.

For years, the 12.80 barrier appeared untouchable. On a stunning day at the NCAA Championships, Ja’Kobe Tharp proved otherwise, producing the kind of performance that reminds fans why sport remains so unpredictable. In a matter of seconds, he turned a routine qualifying round into a landmark moment that will be remembered for generations.

The world record no one saw coming is now a reality—and Ja’Kobe Tharp is the man who changed history.

A new chapter in middle-distance running may have begun in Oslo after American teenager Cooper Lutkenhaus produced one of the most remarkable performances of the season, narrowly defeating reigning Olympic champion Emmanuel Wanyonyi in a thrilling men's 800m contest at the Diamond League meeting.

The 17-year-old sensation shocked a world-class field by crossing the finish line first in a race that came down to the smallest of margins. After an intense battle over the final metres, Lutkenhaus held off Wanyonyi by just one hundredth of a second, producing a dramatic finish that left the packed stadium in disbelief.

From the opening lap, the pace was relentless as the leading contenders positioned themselves for a fierce showdown. As the athletes entered the home straight, Wanyonyi appeared poised to unleash his trademark finishing kick. However, Lutkenhaus refused to be intimidated, matching the Olympic champion stride for stride before producing a perfectly timed lean at the line to secure a historic victory.

The result marks a breakthrough moment for the young American, who continues to establish himself as one of the brightest talents in global athletics. Defeating an Olympic champion at a Diamond League event is a feat many athletes spend entire careers pursuing, yet Lutkenhaus achieved it before reaching adulthood.

For Wanyonyi, the narrow defeat does little to diminish his status as one of the world's premier 800m runners. The Kenyan once again demonstrated his exceptional class and competitiveness, pushing the race to a world-class standard and forcing his young rival to deliver the performance of a lifetime.

Beyond the result itself, the race offered a glimpse into what could become one of the sport's most exciting rivalries in the years ahead. With established stars and emerging talents now pushing each other to new heights, the men's 800m continues to evolve into one of athletics' most captivating events.

On a memorable night in Oslo, the spotlight belonged to Cooper Lutkenhaus. At just 17 years old, he stood toe-to-toe with an Olympic champion and emerged victorious, announcing himself to the athletics world in spectacular fashion.