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Everything to know about the MAF method and letting heart rate guide your runs.

Runners often turn to time or distance, pace or feel to guide their workouts. But to get more precise about intensity, heart rate training offers an objective view of how hard you’re working and can help you get the most out of each step. 

One way to tune into heart rate: the Maffetone method, a.k.a. MAF method. It’s a strategy based on maintaining a low heart rate for most of your runs, with the goal of revving your fat-burning engine and help you avoid injury, illness, and overtraining.

“I’ve coached hundreds of runners through MAF, and for some, it’s been a complete game changer; for others it’s just been massively frustrating,” says Amanda Brooks, Denver-based running coach and founder of Run to the Finish. 

So what is the MAF method exactly, and is it for you? Let’s break it down.

The Idea Behind the MAF Method

This training strategy was created by Phil Maffetone, an applied kinesiologist, following decades of his clinical research about heart rate training. It can be called the Maffetone method or simply MAF—which is (obviously) short for his name but which also stands for maximum aerobic function. 

“The thesis behind the MAF method is that low heart rate training will allow runners to build endurance while reducing their injury risk and avoiding fatigue,” explains Laura Norris, owner and coach at Laura Norris Running in Boulder, Colorado. “This low heart rate zone is where the body oxidizes a higher ratio of fat than carbohydrates for energy production.” 

In other words, MAF keeps you in what’s considered the “fat-burning zone”—though it’s a misconception that running this way always equals fat loss, says Brooks. The benefit is more so that you train your body to run off of fat as fuel, which doesn’t burn as quickly as carbohydrates, so you can run longer.

To take advantage of the MAF method, you need a device to actually track your heart rate, whether that’s a smartwatch or chest strap (research suggests the latter is more accurate in some cases). 

How the MAF Method Works

The MAF method is based on a very straightforward formula: Take 180 (a number Maffetone came up with based on his research) and subtract your age. The resulting number is your max heart rate in beats per minute (bpm), which you should stay under for most runs. 

So, if you’re 40 years old, your heart rate shouldn’t go north of 140 bpm for nearly all your miles. In other words, it ensures that most of your running is easy running, which is the principle that most coaches recommend whether you’re following MAF or not.

But the plan does take a few other factors into account: 

If you’re recovering from a major illness or injury, subtract 10 beats

If you’re not improving in your training or are just coming back to training, or if you get a cold or the flu at least twice a year, subtract 5

If you’ve been training for at least two years without any injury, add 5

If you’re over 65, add up to 10 

If you’re under 16, use 165 bpm for your max

Does sticking under one number for your heart rate for most runs feel too strict though? For some people, it is, says Brooks. “Like most heart-rate running formulas, it doesn’t work for everyone,” she says.

On the other hand, the formula’s simplicity is what makes it so accessible for a wide audience. “It helps give people a guideline for figuring out what easy running should feel like,” Brooks adds. 

Contrary to popular belief, MAF doesn’t mean every single run should be done at a low heart rate. “Many people don’t realize that once you’ve been doing it for a while to build your base or return to running, you are absolutely supposed to start adding back in speed work,” says Brooks. “Then it really turns into a more traditional 80/20 program, but the easy days are defined by your MAF heart rate.”

Benefits of Using the MAF Method

“Where MAF can shine is for runners who have consistent issues with injuries or coming back from illness—it gives them a more specific way to guide training and often prevent running slightly too hard all the time,” says Brooks.

In research that Maffetone conducted, 76 percent of runners who used the method leading up to a 5K improved their race time and only 9.5 percent got an injury, compared with nearly 62 percent of runners who got injured when they maintained their normal training schedule instead of MAF. 

The MAF method is beneficial because of its emphasis on easy running, which should make up the bulk of any running routine. “Whether you call it low heart rate training, zone 2 training, or easy running, there are numerous benefits to runs below one’s aerobic threshold,” says Norris. 

For example, because running at a low heart rate spares glycogen (in favor of fat burning), you can often keep running longer at this intensity and with less fatigue afterward. “Plus, easy running places less stress on the musculoskeletal system, so you can run more mileage while controlling your injury risk,” Norris adds.

Drawbacks of Using the MAF Method

The formula for MAF is simple, which makes it very easy to use, but it can also be limiting. “Some individuals are outliers—they will have higher or lower heart rate zones than generic formulas predict,” says Norris. 

New runners and those over 40 often find it tricky to keep their heart rate low enough. Plus, adds Norris, factors other than age can affect heart rate. “Caffeine consumption, anxiety, hydration status, iron levels, and other variables will all alter your heart rate during exercise,” she says. “You may still be in an aerobic zone, but your heart rate may become decoupled from your oxygen consumption [your aerobic zone] due to caffeine ingestion or dehydration.”

Furthermore, using MAF does require wearing a heart rate monitor so you can keep an eye on your exact number throughout your runs. “Some runners get highly stressed out watching their heart rate,” says Brooks. 

Being that focused on specific numbers isn’t always necessary to achieve results. Runners who trained guided by rate of perceived exertion (RPE) showed similar improvements over six weeks of training, as those who ran guided by their heart rate in a study published in the Journal of Strength and Conditioning Research in 2017.

The Bottom Line on the MAF Method for Runners

MAF can be an approachable training technique to help ensure you’re not pushing too hard on what should be easy runs (that is, the majority of your mileage). But like any running plan, it takes some adjustments and isn’t ideal for everyone. 

“Whenever trying out a new training method, it’s important to assess whether you enjoy running any more or less with this approach,” says Norris. “If you don’t enjoy heart rate training, MAF is not for you.”

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.