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When kids run, they don’t track their heart rates or pay attention to their paces. They just zoom along however fast as they like, and they often laugh while they do it. That kind of joy in running can be rare to capture as an adult. But there’s one workout that brings a bit of that fun back: the Fartlek.

Sure, the term may sound a little silly. For that, you can blame the Swedes—Fartlek translates as “speed play” or “speed game” in Swedish. “I like to remind my athletes that [Fartleks are] just basically playing with speed in a way that feels good to them on the day,” says USATF-, RRCA-, and UESCA-certified running coach Amie Dworecki, CPT. “It does involve some faster running, but running in a way that's fun.”

If this sounds like something your training plan could use more of, here’s what you need to know about Fartlek training, why it could benefit your running, and how to get the most out of this workout.

What is a Fartlek?

The premise of Fartlek training is fairly simple. “It's basically short bursts of speed when you're running mixed in with your regular running pace,” says USATF- and RRCA-certified running coach Marnie Kunz, CPT. Those bursts can be as random as sprinting to the next stop sign every time you see a red car. Or you can have more structured sets of one minute quicker, then three minutes easier, for example. Either way, it’s continuous running, so you return to your relaxed, conversational base pace after each burst of speed.

The idea behind the workout came from Swedish national cross-country coach Gösta Holmér in the 1930s. He wanted to make his struggling team more competitive by combining speed work with endurance training. It worked: His runners began breaking records in multiple events—and the rest of the world began taking notice. Now, Fartleks are a staple part of many running programs.

The difference between intervals and Fartlek training

Both Fartlek and interval workouts are forms of speed training where you push the pace for a while, then let your body recover somewhat before pushing again. But while intervals are precisely measured, and often done on a track, Fartleks are more informal. You can do them anywhere, and the bursts of speed may vary in distance or intensity based on how you’re feeling.

Also, even when you pick up the pace, you aren’t pushing so hard that you need to stop running after a faster burst, says Dworecki. “You don't want to hit that 10 out of 10 to where you feel like you have to walk afterward.” While after an interval, you may take a break to huff and puff on the side of the track with your hands on your knees, the point of a Fartlek is to keep running the whole time to build your endurance while also working on your speed.

These workouts end up being slightly easier on the body because you aren’t pushing quite as hard as you may during intervals. That’s why Dworecki often recommends Fartleks to runners as a precursor to interval training. “It introduces your body into speed work,” she says. That can be helpful both for beginners who are newer to running, or runners who are in the earlier stages of a training cycle.

How Fartleks can improve your running

Fartleks have several benefits if you work them into your training strategically.

1. They can help protect your body against injury

Because Fartleks can be used as a way to ease into speed work, Dworecki says they can help to keep your body healthy. “It helps you prevent injuries that might come up if you just jumped into interval training,” she says. For the same reason, she often gives her athletes Fartleks during the week after they’ve had an especially difficult long run when she’s afraid they may not be recovered enough to do harder intervals or tempo runs.

2. They can make you faster

Fartleks are a great way to improve your VO2 max (the gold standard for measuring cardio fitness) and increase your lactate threshold (the point at which lactate accumulates faster than your body can handle, leading to fatigue), according to the National Strength and Conditioning Association. One small 2020 study found that regular Fartlek training can also significantly improve muscular endurance1.

What makes Fartleks unique is that they keep your heart rate high, rather than letting it come all the way down between intervals. This trains your body (and mind) to push hard even as you get tired. “Your body adapts to running faster even when you're fatigued because you're running throughout the workout—you don't get a full recovery,” says Kunz. This can be especially helpful practice for races, where you may want to speed up for a bit to pass other runners, and then still keep running to the finish line.

3. They can help you improve your running form

Spending some time running faster can make you run more efficiently. “You’re improving your biomechanics,” says Kunz. For example, to speed up, most of us naturally pick up our knees more, lean forward, and increase our cadence. All of these add up to a better running form.

4. They can help you rediscover the fun of running

Intervals typically feel like hard work. But a Fartlek can make running feel more like play. “This is a workout that really should leave you feeling good and invigorated,” says Dworecki. And for runners who normally only do steady-paced runs, a Fartlek can switch things up in an unintimidating way.

How do I start Fartlek training?

For beginners, both coaches recommend starting with Fartleks by adding three or so faster segments into your regular run. Each burst should be about 100 meters or a minute long. Then give yourself three to five minutes to recover in between. Don’t worry if that feels too easy. “If you feel like you can do more, then the next time do a little bit more. But it's always better to feel good at the end of your workout rather than risking injury,” Dworecki says.

Advanced runners can work about eight or so faster segments into a Fartlek run. Dworecki suggests keeping each between one and two minutes and doing them at whatever pace feels good to you, with one minute of recovery in between.

No matter your level, remember the basics: Make sure to start with a solid warmup of pre-run dynamic stretches then at least 10 minutes or one mile of easy running, says Kunz. After the speedy stuff is done, finish off with another 10-minute cooldown of easy running.

How to make the most out of Fartlek training

Even though Fartleks are a more casual approach to speed training, they still take a toll on your body. Use them conservatively, warns Dworecki. “It's not a workout you want to do every day because you can overdo it,” she says. Any kind of speed work—whether that’s Fartleks, intervals, or tempo runs—should only be done about once a week, or twice at most if you’re a more experienced runner.

And remember: Don’t take your Fartleks too seriously. These workouts should add a sprinkle of playfulness to your running routine. “You don't want to go too strict on it,” says Dworecki. Instead, just have some fun seeing how fast you can go.

The prospect of seeing one of athletics' biggest stars back on the track is growing stronger, with Jakob Ingebrigtsen reportedly targeting a return to competition later this summer following his recovery from Achilles tendon surgery.

According to comments made by his agent, Daniel Wessfeldt, in an interview with Norwegian media, the double Olympic champion could make his long-awaited comeback at one of three major European meetings in July. The leading options under consideration are the Monaco Diamond League on July 10, the Hungarian Athletics Grand Prix on July 14, and the London Diamond League on July 18.

For athletics fans, the possibility of Ingebrigtsen lining up in London would add another layer of excitement to an already highly anticipated Diamond League meeting. The Norwegian middle-distance sensation has become one of the sport's most dominant figures in recent years, collecting Olympic, world and European titles while consistently rewriting record books.

His 2026 campaign was put on hold after he underwent surgery on his Achilles tendon earlier this year, forcing him to focus on rehabilitation rather than competition. Since then, questions have surrounded when the 24-year-old would be ready to return to racing.

The latest update suggests that decision will largely depend on how his training progresses over the coming weeks. If recovery continues according to plan, July could mark the beginning of his return to elite competition ahead of the latter stages of the season.

A comeback at either Monaco, Budapest or London would immediately place Ingebrigtsen back among the sport's biggest storylines. Each meeting is renowned for producing world-class performances, and any appearance by the Norwegian would attract significant attention from fans eager to see how quickly he can regain top form after his injury setback.

While no final decision has been confirmed, the signs are increasingly positive. After months away from competition, Jakob Ingebrigtsen appears to be edging closer to a return, with London's Diamond League meeting emerging as one of the most intriguing possibilities on his road back to the track.

Should his recovery continue smoothly, athletics could soon welcome back one of its brightest and most influential stars.

What should have been the defining moment of Emad Bashir-Mohammed's young running career instead turned into one of the most talked-about controversies in American road racing this year.

The 23-year-old crossed the finish line first in the men's citizen's race at the prestigious Bolder Boulder 10K on Memorial Day in Colorado, stopping the clock at an impressive 29:50. His performance was not only a commanding victory but also one of the fastest winning times ever recorded in the event's long and celebrated history. Bashir-Mohammed finished eight seconds clear of his nearest challenger and appeared to have secured a breakthrough triumph.

For nearly two hours, he was the undisputed winner.

Then everything changed.

Race officials announced that Bashir-Mohammed had been disqualified after determining that he had started in the wrong wave. According to Bolder Boulder regulations, he had been assigned to the AA wave but lined up with the faster A wave, which began earlier. Event rules allow runners to move backward into a slower wave, but prohibit athletes from advancing into a faster one.

As a result, Bashir-Mohammed's victory was erased from the record books.

The citizen's title was subsequently awarded to Nickolas Scudder, who crossed the line second in 29:58. The promotion handed Scudder back-to-back citizen's race victories, while Bashir-Mohammed was left to grapple with the disappointment of losing a win he believed he had earned on the road.

The disqualification has since ignited widespread debate across the running community.

Bashir-Mohammed maintains that he did not intentionally violate the rules. He claims that after collecting his AA bib, he spoke with race personnel and was permitted to start with the A wave after presenting evidence of his recent performances. In a statement shared after the race, he expressed frustration over the decision, arguing that his goal was simply to compete against the strongest field available and produce the fastest time possible.

Race organizers, however, stood firmly behind their ruling. Officials stated that wave-assignment regulations are clearly communicated in pre-race information and reiterated during packet collection. They also noted that hundreds of participants are disqualified each year for moving into faster start groups, emphasizing that consistent enforcement is necessary to maintain fairness for all competitors.

The incident has divided opinion among runners and fans alike. Some believe the rules must be applied equally regardless of an athlete's finishing position, arguing that wave assignments are a fundamental part of race organization. Others feel the punishment is harsh, particularly if Bashir-Mohammed genuinely received approval to move up before the start.

What remains undisputed is the quality of his performance. On the roads of Boulder, Bashir-Mohammed demonstrated the fitness and speed required to outrun the field by a significant margin. Yet in road racing, crossing the finish line first is only part of the equation. Compliance with race regulations carries equal weight.

For Bashir-Mohammed, the day will be remembered as a painful lesson in the fine margins that can define elite competition. A remarkable run delivered a memorable victory, but a dispute over wave placement ultimately overshadowed the achievement, leaving behind a controversy that continues to fuel discussion throughout the running world.

A fast race, a costly administrative error, and a debate that may linger long after the finish-line tape has been packed away.

The men's 100 metres at the 2026 Rome Diamond League is shaping up to be one of the most anticipated sprint races of the season, with an exceptional field featuring some of the fastest men in the world.

Scheduled for Thursday, June 4, at the iconic Stadio Olimpico in Rome, the race will bring together reigning stars, established champions and emerging talents in a contest that promises fireworks from the moment the gun goes off.

Kenya's Ferdinand Omanyala headlines a world-class lineup that includes American sprint sensation Noah Lyles, Botswana's Olympic champion Letsile Tebogo, Jamaica's explosive Ackeem Blake, South Africa's ever-consistent Akani Simbine and Italy's hometown hero Lamont Marcell Jacobs. With personal bests ranging from 9.77 to 9.97 seconds, the field is packed with athletes capable of producing something special on the Diamond League stage.

Omanyala, the African record holder with a blistering personal best of 9.77 seconds, arrives in Rome eager to continue his strong early-season form and prove he can challenge the very best on the global circuit. The Kenyan star has built a reputation as one of the fastest starters in world sprinting and will be looking to make a statement against an elite field.

Standing in his way is world champion Noah Lyles, whose personal best of 9.79 seconds places him among the fastest athletes in history. The American remains one of the sport's biggest attractions and will be determined to add another Diamond League victory to his impressive résumé.

The race also marks a major test for Olympic champion Letsile Tebogo. The Botswanan star has rapidly become one of athletics' most exciting talents, while Ackeem Blake continues to establish himself as a serious contender on the international sprint scene.

Adding further intrigue is the presence of Italy's Lamont Marcell Jacobs. Competing on home soil, the Tokyo Olympic champion will enjoy passionate local support as he seeks to deliver a memorable performance in front of the Roman crowd.

South Africa's Akani Simbine, Cameroon's Emmanuel Eseme, Great Britain's Jeremiah Azu and rising American talent Jordan Anthony complete a field that boasts remarkable depth and quality.

Men's 100m Entry List – Rome Diamond League 2026

Ferdinand Omanyala (Kenya) – PB: 9.77

Noah Lyles (USA) – PB: 9.79

Lamont Marcell Jacobs (Italy) – PB: 9.80

Akani Simbine (South Africa) – PB: 9.82

Letsile Tebogo (Botswana) – PB: 9.86

Ackeem Blake (Jamaica) – PB: 9.88

Jordan Anthony (USA) – PB: 9.91

Emmanuel Eseme (Cameroon) – PB: 9.96

Jeremiah Azu (Great Britain) – PB: 9.97

With multiple national record holders, global champions and Olympic medal contenders sharing the same start line, the Rome Diamond League men's 100m could deliver one of the fastest races of the year. For sprint fans around the world, all eyes will be on Rome as a stellar cast battles for supremacy over athletics' blue-riband distance.

Audrey Werro announced her arrival as one of the early stars of the 2026 outdoor season with a commanding victory in the women’s 800 metres at the Rabat Diamond League, producing a performance that exceeded even her own expectations.

The Swiss middle-distance talent surged to victory in a brilliant 1:56.56, breaking the meeting record and delivering one of the fastest times recorded worldwide this season. In a race packed with quality, Werro displayed exceptional composure, confidence, and finishing strength to separate herself from the field and stamp her authority on the event.

What made the performance even more remarkable was the athlete's surprise at the level she had already reached so early in the campaign.

"I was not expecting such a strong start to the season," Werro admitted after the race.

The race unfolded at a relentless pace, but Werro remained perfectly positioned throughout. As the athletes approached the bell lap, she glanced at the clock and immediately sensed something special was within reach.

"When I saw the time at the bell, I felt really confident," she said. "I'm really happy with the Meeting Record and looking forward to the rest of the season."

Her confidence proved justified. Maintaining her rhythm over the final 400 metres, Werro powered down the home straight to secure the victory and rewrite the Rabat meeting record books in the process.

The performance sends an early warning to her rivals ahead of a season that promises major championships and high-profile Diamond League battles. Beyond the record-breaking time, Werro's display highlighted her growing maturity as a racer, combining tactical awareness with impressive speed and endurance.

With the outdoor season only beginning, the 1:56.56 clocking suggests that even faster times could be on the horizon. If Rabat is any indication, Audrey Werro may be poised for the biggest season of her career.

Her emphatic victory in Morocco was more than just another Diamond League win—it was a statement of intent from an athlete determined to challenge the world's best throughout 2026.

The city of Boston is set to welcome back one of its most celebrated champions as Kenya’s Sharon Lokedi headlines a world-class field for the 2026 B.A.A. 10K presented by Mass General Brigham Cancer Institute on June 21.

Fresh from another remarkable victory at the Boston Marathon in April, Lokedi returns to the streets of Boston and Cambridge carrying both momentum and confidence as she aims to defend the title she captured in dominant fashion last year.

The two-time Boston Marathon champion has developed a special connection with the historic race city. In 2025, she produced a course-record performance of 2:17:22 to win the Boston Marathon before returning this year to claim another victory in 2:18:51, the second-fastest winning time in the event’s storied history. Her success has cemented her status as one of the premier road runners in the world.

Lokedi will be making her first competitive appearance since her marathon triumph and arrives as the reigning B.A.A. 10K champion after clocking 31:39 over the challenging 6.2-mile course in 2025.

“Boston has become a very special place for me,” Lokedi said ahead of the race. “The atmosphere created by the fans and the community is unlike anywhere else. I’m excited to return and give everything I have to defend my title.”

The women’s race promises to be highly competitive. American Olympian Rachel Smith, who finished second at the Boston 5K in April, leads the domestic challenge. Kenya’s strong contingent includes African 10,000m champion Gladys Kwamboka, former B.A.A. 10K runner-up Stacy Ndiwa, and experienced road racer Viola Cheptoo. British Olympian Jessica Warner-Judd adds further international depth to a field packed with proven performers.

The men’s race is equally impressive, featuring elite athletes from 13 nations.

Ethiopia’s Dawit Seare enters as one of the leading contenders after capturing the 2025 Boston 5K title and bringing the fastest 10K personal best in the field at 27:21. Kenya will be represented by an accomplished group led by Alexander Mutiso, winner of the 2024 London Marathon and runner-up at last year’s New York City Marathon.

Patrick Kiprop also arrives in outstanding form after securing victory at the prestigious BolderBoulder 10K on Memorial Day, while Alex Masai returns looking to continue his strong record in Boston. Masai recently finished ninth at the Boston Marathon and has earned three top-ten finishes at the B.A.A. 10K.

Among the international stars making their mark is South Africa’s Adriaan Wildschutt, who makes his race debut after an impressive season highlighted by victory at the NYC Half Marathon in 59:30. Ethiopia’s Olympic bronze medallist Hagos Gebrhiwet adds further quality to the field, bringing a wealth of championship experience and previous success in Boston.

Canadian national 10K champion Andrew Alexander, two-time U.S. Olympian Hillary Bor, marathon standout Ryan Ford, and reigning USA 25K champion Andrew Colley complete a field stacked with talent and depth.

With defending champions, Olympic finalists, national champions and rising stars all converging on Boston, the 2026 B.A.A. 10K is shaping up to be one of the most competitive editions in recent memory. For Sharon Lokedi, however, the mission is simple: return to the city where she has repeatedly excelled and add another memorable chapter to her growing Boston legacy.