Running News Daily

We looked at a ton of data from last year’s fall marathons to see what Boston Qualifier (BQ) runners did differently in training and racing

In our monthly column in partnership with Strava, we take a deep dive into compelling data points that reveal the more human side of sport. 

In 2023, a record-breaking 33,058 athletes applied for the 128th Boston Marathon. Of those, just 22,019 were accepted (pending final verification). Qualifying times are established for different age and gender categories. Still, with so many applicants, the unofficial cutoff times for acceptance were five minutes and 29 seconds faster than the official qualifying time many athletes push for.

Looking at data from several 2022 marathons, interesting trends emerge. We analyzed Strava data from the Berlin, Chicago, Marine Corps, New York City, CIM, and Valencia marathons. Here’s what the data tells us about qualifying for the Boston Marathon.

Before we get too deep into the data, it’s worth discussing the fact that the above courses have different course dynamics and demographics, which influence median finishing times. Berlin, CIM, and Valencia are all fast courses that attract folks gunning for a BQ. (Hola Valencia! Peep that four feet of total gain, with a net descent of 106 feet.) CIM has a particularly high percentage of BQs since it combines a fast course with a smaller field—many run CIM specifically to qualify for Boston.

Last year was a record-breaking heat year at the NYC Marathon, which resulted in an anomalously low negative-split rate. More than 2,000 runners didn’t cross the finish line in 2022, with temperatures soaring to 75 degrees with  75 percent humidity, which radically affected finishing times. We’ll still look at data from NYC, but 2022 was exceptional. Only 30 percent of runners at NYC who were aiming for a sub-three finish met that goal, and only half of runners looking to go sub-four did so.

Across all the marathons we analyzed, athletes had similar training. Most started at a base of around 20 miles a week and a 10-mile long run. On average, they worked up to a 30-mile week and a 20-mile long run. While there’s a slight variation in average miles per week (mpw), the training time in the peak week is similar (and each race has a different mix of target paces for participants).

CIM had the highest average mileage baseline and peak week, suggesting that it attracts more experienced runners with a specific goal in mind. CIM runners started with a 30 mpw base and progressed to a 50-mile peak week and 21-mile long run. BQ runners at CIM started with a 43-mile peak week (the highest of any marathon analyzed). When we just look at athletes who hit the BQ standard to equalize the field, CIM runners have a higher baseline and peak week.

While many newer distance runners tend to focus on flashy long runs, the distance of the longest run was not strongly correlated with a BQ. Comparing BQ runners and all other athletes, the distance of the longest run was 20 to 22 miles across each marathon. But, the base mileage was higher for BQ runners, bearing in mind that base volume matters more than the distance of any long run. BQ runners at CIM averaged 65 miles during their peak week, while the rest of the field averaged 50 mpw. Similarly, Chicago BQers averaged 57 miles during peak week, compared to the rest of the field’s 41 mpw peak week.

Interestingly, there was not a strong correlation between success on hillier courses and runners averaging more elevation gain in their training. Across all races, BQ runners did have more elevation in their training. For example, CIM and Berlin BQers had 15 percent more elevation gain in their training than runners who didn’t BQ (even when you control for average mileage). CIM runners hit the most vertical gain, averaging 100 feet of elevation gain per mile over the training cycle.

There’s no teacher like experience, and marathons are no different. Runners who finished one of the above races between 2:30 and 2:59 on average have completed six previous marathons. Runners who finished between 4:00 and 4:30 had completed, on average, four previous marathons. Experience helps with pacing, fueling, and other elements of the marathon that are sometimes only learned through trial and error.

Keep easy days easy. There’s a strong positive correlation between keeping training runs intentionally slower than race pace and runners hitting their goal pace (defined as the pace runners averaged over the first eight miles of the marathon). Running slower than marathon effort helps build dense capillary beds, strengthen the heart, increase stroke volume (the amount of blood your heart can pump per beat), and increase the endurance capabilities of your muscle fibers by increasing the number of mitochondria in muscle cells. Running too fast causes the breakdown of bone and muscle tissue at a rate that can’t be outpaced in recovery; plus it makes the body less efficient at processing oxygen.

Runners that kept easy runs about 30 percent slower than goal pace had a 27 percent success rate, finishing at or close to their goal time. For runners who did easy runs only 10 percent slower than their goal pace (the approach of about a third of the runners analyzed), only 19 percent met their goal time, equating to a 31 percent reduction in success rate. Of runners who did “easy” days around marathon pace, only 14 percent hit their goal time.

Faster runners, who are more experienced, keep easy runs easier. Runners who finish in 2:30, on average, run their easy days 29 percent slower than goal pace. Compare this with runners who finish an hour later in 3:30, whereas the average runner ran their easy days just 11 percent slower than race pace, and only 20 percent hit their goal finish time.

Runners aiming for a 3:00 marathon (6:52 mile-pace) should shoot for easy days between 7:48 and 8:36. Runners looking to hit a 3:30 time (8:01 mile-pace) should strive for easy days between 9:02 and 9:56, and 4-hour marathoners (9:09 mile-pace) should shoot to keep easy days between 10:11- and 11:11-minute miles. As demonstrated by the data, to go fast, you have to learn to run slow.

Of all the courses, CIM and Valencia had the highest percentage qualifying for Boston, with 32 percent of the field BQing. Only six percent of NYC runners hit the Boston standard (heat!), and the Marine Corps Marathon, popular amongst beginner runners, had a similar qualifying rate. At Chicago and Berline, 18 percent of the runners qualified.

NYC and Marine Corps had the slowest median finish time, just over 4:30, averaged across all runners (NYC usually runs faster in cooler years). NYC is also the largest race, with over 47,000 competitors (compared to CIM’s 10,000). Valencia had the quickest average finish time (3:28), with a relatively small field of 30,000 runners.

Even more than gain and loss, the strongest predictor of BQ success was a negative split, running the second half of the race faster than the first. Take, for instance, Kelvin Kiptum’s recent world record win in Chicago, in which Kiptum ran a 59:47 negative split to run just 35 seconds over the two-hour barrier.

Just three percent of NYC runners (the heat! The humidity!) negative split in the rising temps, again pointing to an outlier year in NYC. Eleven percent of runners negative split both Chicago and Marine Corps, but experience won out in the Chicago crowd, with its 18 percent BQ rate, eclipsing Marine Corps’ six percent (a race that traditionally has more beginner runners).

Berlin and CIM both boosted a 16 percent negative split rate, though a higher percentage (32 percent) of CIM runners hit the BQ compared to Berlin’s 18 percent. Valencia had the highest percentage of negative splits. Still, a significant portion of that can be attributed to the extremely flat course, with just enough downhill to boost speed but not enough to bash the quads too badly.

So, if you’re searching for an elusive BQ, here’s what the data show: slow your runs down, choose your course wisely, shoot for a negative split, and remember that practice makes perfect. It may take a couple of marathons to get it absolutely right, but that experience will be invaluable.

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.