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Most wearables track this metric, but it goes beyond simply paying attention to stats. 

When it comes to running these days, wearables have become a part of the “uniform.” If you sift through race photos, you’ll probably see both recreational and professional runners looking down at their smartwatches at the finish line rather than glancing up to smile at the camera. 

While most smartwatches capture basic metrics such as activity duration, heart rate, pace, and time, not all can measure the physiological effect of workouts over time or what’s known as “training load.” But with the new Apple training load feature, watchOS 11 will join the ranks of Garmin, Coros, and Polar and start providing insights into this metric. 

So, if you’re considering buying a smartwatch—or you just want to better track your training and your progress—let’s learn about what training load is and how it can help or hinder your running.

What is training load?

Researchers of a scientific review published in Sports Medicine in 2017 define training load as the stress an athlete experiences after completing physical activities over a certain duration, most often a week. Another way to think about it is how hard you are physically working over time. 

Training load is comprised of both an internal and external load. Internal load refers to the physiological and psychological effects of exercise on the body such as heart rate and rate of perceived exertion during exercise. The higher the heart rate or the harder a workout feels, the greater the internal load. External load refers to quantification of the work completed, such as pace and distance.

Sara Manderscheid, RRCA-certified endurance run coach and founder of Elevate Your Running, describes training load as the amount of stress that flows through the body in a training session or training season. “Every day is going to be different,” she says, referring to both the physical and psychological workload an athlete feels with both easy and challenging workouts. 

Ric Rojas, head coach of Ric Rojas Running and coach with RISE Running in Boulder, Colorado—and father of pro runner Nell Rojas—highlights that both volume and intensity play roles in understanding an athlete’s perceived exertion. And that perception of exertion helps him determine whether training load is too high or too low. “Language and body language are the most important indices [of training load] that I use on a day-to-day basis,” he explains.

How do wearables measure training load?

Metrics used to estimate training load tend to differ among brands. For example, Garmin uses heart rate to estimate excess post-exercise oxygen consumption (EPOC), the amount of oxygen your body uses to return to homeostasis—a rested, refueled, and recovered state after a workout. 

In general, EPOC accumulation is higher for more intense workouts and lower for easy efforts. EPOC measurements over a seven-day period equal your training load for the week. So, the higher your EPOC measurements, the higher your weekly training load.

Both Coros and Polar use training impulse (TRIMP) to estimate training load. TRIMP uses heart rate and workout duration to estimate effort during a workout with higher heart rates presumably reflecting higher efforts and higher TRIMP. Unlike EPOC, TRIMP may not be as reliable in estimating training load for strength training sessions, because it relies on metrics acquired during a workout rather than after. 

Unlike Garmin, Coros, and Polar, Apple’s watchOS 11 will not provide a numeric value for training load. Instead, training load will be derived from workout duration and effort scores based upon a rate of perceived exertion scale from 1 to 10 with 1 equating to easy effort and 10 meaning an all-out effort. These scores can be generated automatically for 17 different workout types using an algorithm that incorporates age, height, weight, and performance metrics like GPS data, heart rate, and elevation. Scores can also be self-reported for any workout, a feature that distinguishes watchOS 11 from the rest of the pack.

After 28 days, the watchOS 11 algorithm establishes a training load baseline, and uses it to compare your training load over a seven-day period. The goal is to keep your seven-day training load or estimation of effort close to your 28-day baseline. 

Can I use training load to build my workouts?

You certainly can! Many wearables prompt users with recommended workouts to help maintain training within an optimal load. Visual cues and graphics can also help users identify when fitness and fatigue are not balanced, which is an issue because too much fatigue can lead to overtraining, whereas workouts that may not be as challenging may hinder the ability to improve fitness. 

Rojas uses heart rate data, pace, perception, recovery, and overall distance in a workout to generate the next workout (or workouts) and avoid overtraining. “I have to keep you healthy,” he comments. “I maintain an optimal training level to allow you to work out again without missing any time.” 

To ensure balance in both training and recovery, Rojas also prioritizes an athlete’s perception of their effort during a workout. He will have athletes repeat the same workout every four weeks and evaluate how they felt at the prescribed paces. If the workout feels easier with time, they are likely building fitness. This should also correlate with heart rate: As you become more fit, your heart rate will get lower at the same pace—proof that “the training is taking you to the next level,” he says.

Manderscheid also uses perception more than the numbers, stating that communication is one of the best tools coaches have. “I feel that the mind is such a huge piece to training as a whole,” she says. She also emphasizes that it’s a fine balance of ensuring you do enough to gain fitness but don’t go overboard and set yourself up for injury.

Following Rojas’s and Manderscheid’s advice, you can use training load to schedule your own workouts by paying attention to effort and/or heart rate throughout a workout and throughout your week as a whole. You want a majority of easy efforts (RPE around 5 or 6 and heart rate around 60 to 70 percent) and a few harder efforts, like tempos or interval runs, mixed into your weekly schedule. 

Keep in mind, if your typical paces start to feel hard or spike your heart rate, it could be an indication to lower your training load by taking an extra rest day or swapping a tempo run for an easy run. And if your typical paces start to feel too easy, it could mean you can increase your training load by adding more miles, faster paces, or another day of easy running.

Are there any downsides to tracking training load?

Metrics based upon algorithms have their pitfalls and training load is no different. Heart rate is one of the primary determinants of training load so anything that affects your resting heart rate (stress, sleep, etc.) can also influence training load. 

Apple’s training load is also dependent on an effort rating system comparing seven-day training load to a 28-day baseline. So, if you rate a tough workout as a very easy effort, your watch will assume you are training below your baseline training load, which may prompt you to increase your effort. If you continue to rate hard efforts as easy, you may set yourself up for insufficient recovery, overtraining, and injury (especially if the workouts weren’t truly easy). 

On the flip side, if you rate easy workouts as feeling hard, your watch will suggest you are training above your baseline, prompting you to decrease effort. As a result, you may not see fitness gains, because without a sufficient physiologic stimulus, you’ll likely plateau or lose fitness. 

Both Manderscheid and Rojas note that there is incredible potential for over and undertraining when following training load on wearables in isolation for your workouts and progress tracking. 

Manderscheid says training load is “one piece of the puzzle,” noting that it is easy for athletes to get bogged down in the analytics of their watch. “Can we stop, pause, and listen to our bodies? If we can connect a little bit more to that mind-body side of things, we are going to be stronger athletes,” she says.

What if you don’t have a wearable? How can you track training load?

If you don’t have a wearable, you don’t need to run out and get one; most of these devices are not cheap. Perceived effort—similar to what the Apple Vitals app is using to generate training load—is a free, easy, and reliable way to determine whether your workout is too easy, too hard, or just right.

Remember: You want a mix of both easy days and hard days on your calendar, without tipping too far in one direction. Both Rojas and Manderschied advise running easy efforts most days and incorporating harder efforts or intensities twice a week as a general guideline.

Manderscheid suggests going a step further than just mentally noting efforts and writing down how you felt at a particular workout. “At the end of the week, take a look, how did you feel: Did you feel good, strong, or terrible? Monitor that. Play around with it and experiment,” she explains.

Numbers are just a part of the puzzle in terms of how you can progress. “Keep the long view in mind,” Rojas says. Patience and perception work together to generate resilient, recovered runners capable of stacking training cycles. You can certainly be one of them, as long as you listen to your body—not just your watch—when it comes to your workout efforts and not going too hard or too easy all the time.

Jakob Ingebrigtsen brought his remarkable 2026 season to a fitting close on home soil, winning the men’s street 1500m at the inaugural Runfest Norway in Sandnes on Friday.

Competing in front of an enthusiastic hometown crowd, the Olympic and world champion took control of the race from the early stages and maintained his authority through the finish, stopping the clock at 3:40.7.

Andreas Fjeld Halvorsen followed in second in 3:43.3, while Sigurd Tveit completed the podium in 3:47.8.

The unusual street race added another dimension to the occasion, with 273 runners taking part on the same road and sharing the course with one of Norway’s most accomplished distance runners. For the recreational participants, it offered a rare opportunity to compete alongside Ingebrigtsen in an event that brought elite athletics and mass participation together.

The victory also provided a fitting final chapter to a season that began with significant uncertainty for Ingebrigtsen. After undergoing major Achilles surgery in February, the Norwegian was forced to miss a substantial portion of the summer campaign as he worked his way back to full fitness.

His return, however, quickly developed into another championship-winning chapter. In Birmingham, Ingebrigtsen captured European 5,000m gold before adding another major title at the inaugural World Athletics Ultimate Championship in Budapest, where he won the 5,000m.

Those performances transformed what could have been a disrupted season into another year defined by championship success and a determined return to the highest level.

Now, with the Sandnes victory added to his 2026 record, Ingebrigtsen closes the year exactly where it began in spirit — overcoming adversity, rebuilding his form and once again competing at the front.

From Achilles surgery in February to major championship victories and finally a 1500m win before his hometown crowd, the Norwegian has given his 2026 season a memorable final scene.

Olympic 100m hurdles champion Masai Russell has announced her engagement to longtime partner Robert “Robbie” Springfield, adding a major personal milestone to the remarkable journey of one of America’s leading track and field stars.

Russell shared the news with her followers, revealing that Springfield had proposed and that she had accepted. Reflecting on their relationship, the Olympic champion described him as her best friend and expressed her excitement about spending the rest of her life with him.

The couple’s relationship dates back to their college years at the University of Kentucky, where both were student-athletes and competed in track and field. Russell established herself as a standout hurdler, while Springfield competed in the long jump, giving them a shared understanding of the demands, sacrifices and pressures that come with pursuing success in athletics.

Springfield has since transitioned from competition into coaching. A former collegiate long jumper, he is now part of the coaching staff at Morehead State University, where he works with the programme’s sprinters and jumpers.

Their relationship has developed alongside Russell’s rise to the top of the sport. The defining moment of her career came at the Paris 2024 Olympic Games, where she captured gold in the women’s 100m hurdles, securing her place among the sport’s Olympic champions.

Away from competition, Springfield has remained a familiar part of Russell’s journey, sharing in the demanding periods of training and competition that accompanied her pursuit of Olympic success. Their connection has consequently grown from a college athletics relationship into a long-term partnership.

The engagement now marks another significant chapter for Russell, this time away from the track. After reaching the pinnacle of her sporting career in Paris, the 100m hurdles champion is beginning a new phase of her personal life alongside a partner who has been part of her journey since their university days.

From competing on the same collegiate stage to building a future together, Russell and Springfield’s story has evolved alongside two careers shaped by track and field. The Olympic champion will now balance this new personal chapter with her continuing ambitions in athletics

The women’s race at the 2026 TCS Amsterdam Marathon is shaping up to be one of the most competitive editions in recent years, with a deep international field set to take on the fast Dutch course on Sunday, October 18.

At the centre of the contest will be four Ethiopian athletes who have already broken the 2:20 barrier, creating the prospect of a fascinating battle for victory and a possible assault on the course record of 2:16:52.

Defending champion Aynalem Desta will return to Amsterdam looking to retain her title after producing the biggest performance of her career at last year’s 50th edition. Desta won in a personal best of 2:17:37, establishing herself among the leading marathoners in the field and setting the benchmark for this year’s contenders.

Standing in her way will be fellow Ethiopian Meseret Belete Tola, a former Amsterdam champion who knows exactly what it takes to succeed on the course. Belete Tola captured the 2023 edition in 2:18:21, and her return adds another layer of experience and proven quality to an already formidable lineup.

The field also includes Mestawut Fikir Truneh, who arrives with an impressive marathon pedigree. Truneh finished runner-up at the 2024 Berlin Marathon in 2:18:48, demonstrating her ability to compete at the highest level on one of the world's major marathon stages.

Completing the quartet of sub-2:20 Ethiopians is Buze Diriba, whose personal best of 2:19:34 places her firmly among the leading contenders. With four athletes possessing credentials below 2:20, the race is likely to develop into a tightly contested battle from the opening kilometres.

The depth extends well beyond the leading quartet. Desi Jisa Mokonin, representing Bahrain, Yeshi Kalayu Chekole of Ethiopia and Nazret Weldu Gebrehiwet of Eritrea have all established themselves as serious marathon competitors with performances approaching the 2:20 mark.

Another major name to watch is Abeba Aregawi, the former 1500m world champion representing Sweden. Aregawi has successfully transferred her talents to the marathon and made headlines earlier this year by setting a Swedish national record of 2:23:12 on her debut. Her presence adds another intriguing dimension to an already high-quality field.

Amsterdam’s marathon course has consistently provided an opportunity for elite athletes to produce fast times, and this year’s women’s lineup has the depth to turn the race into a genuine test of both championship racing and outright speed.

With four athletes already inside 2:20, two former Amsterdam champions returning to the start line and several other accomplished marathoners ready to challenge them, the battle is expected to remain open deep into the race.

The ultimate target will be the Amsterdam women’s course record of 2:16:52. Whether the leading contenders can threaten that mark remains to be seen, but the quality assembled for October 18 ensures that the record will be firmly in the spotlight when the race reaches its spectacular finish inside the Olympic Stadium.

The 2026 Valencia Half Marathon is shaping up to be a thrilling contest of speed, endurance and tactical brilliance, with some of the world’s finest road runners set to converge in Spain on October 25.

Kenya’s Daniel Ebenyo and Alex Matata will be among the leading contenders, facing a formidable Ethiopian challenge spearheaded by Jemal Yimer and Tadese Worku. The field also features Rodrigue Kwizera, who boasts the fastest personal best among the leading entrants at 58:16.

Ebenyo arrives with a personal best of 59:04, placing him firmly among the athletes capable of sustaining a demanding pace over the 21.1-kilometre distance. Matata, who owns a 59:11 best, adds further Kenyan strength, while Andrea Kiptoo brings another sub-60-minute credential to the race.

Yimer has already established himself as one of the fastest athletes in the field with a 58:33 personal best, while Worku has clocked 58:35. Kenya’s Owen Korir, with a best of 58:58, further underlines the remarkable depth of the men's lineup.

Valencia Half Marathon 2026 Entries

1. Rodrigue Kwizera (Spain) — 58:16

2. Jemal Yimer (Ethiopia) — 58:33

3. Tadese Worku (Ethiopia) — 58:35

4. Owen Korir (Kenya) — 58:58

5. Daniel Ebenyo (Kenya) — 59:04

6. Alex Matata (Kenya) — 59:11

7. Andrea Kiptoo (Kenya) — 59:11

8. Thierry Ndikumwenayo (Spain) — 59:42

9. Said Mechaal (Spain) — 1:00:24

10. Adel Mechaal (Spain) — 1:02:30

Kwizera, who finished second in Valencia last year, leads the field on paper and will be seeking another standout performance on the famously fast Valencia course. With several athletes carrying sub-60-minute credentials, the race has the ingredients for an aggressive battle from the opening kilometres.

Beyond the headline names, the men’s field is deep and highly competitive, bringing together a strong collection of experienced international athletes with proven ability over the half-marathon distance. With so much quality packed into the lineup, the race promises an intriguing battle in which tactics, endurance, positioning and finishing speed could all play a crucial role in determining the eventual champion.

Yet personal bests will count for little once the gun goes off. The title could ultimately be decided by patience, positioning and the ability to respond when the pace begins to rise in the closing stages. Every surge, every tactical move and every second saved could prove decisive on the road to the finish.

With Kenya, Ethiopia and Spain represented by athletes of exceptional quality, Valencia promises a high-octane men's showdown in which the leaders are likely to be separated by only a handful of seconds. The final kilometres could provide the defining moments of a race packed with speed, ambition and anticipation.

On October 25, the question will be simple: who has the strength to command the streets of Valencia and claim the coveted half-marathon crown?

 

April 19, 1982. The Boston Marathon unfolded under unusually warm, sunny conditions, and by the closing stages, the race had become a private battle between two very different American runners: Alberto Salazar, already one of the biggest names in distance running, and Dick Beardsley, the Minnesota runner who had emerged as a serious marathon contender.

For roughly nine miles, from the Newton Hills toward the finish, Beardsley did much of the leading, with Salazar tucked close behind. Neither man could shake the other. They ran deep into Boston locked together, trading surges and refusing to surrender an inch as the crowds along the course grew louder.

Salazar finally made his decisive move with less than a mile remaining. He opened a small gap, but Beardsley refused to disappear. The Minnesota runner chased him through the final streets, closing again as they approached the finish.

Then came the final sprint.

Salazar held his form and reached the finish first in 2:08:52, with Beardsley only two seconds behind in 2:08:54. It was an extraordinary result: both men broke 2:09 in the same Boston Marathon, and both shattered the previous course record.

The race became known as the “Duel in the Sun,” and it remains one of the most celebrated head-to-head battles in Boston Marathon history. Beardsley had not won, but his performance established him as one of America's elite marathoners.

For Salazar, however, victory came at an enormous physical cost. Immediately after crossing the finish line, he collapsed and required emergency treatment, including several litres of intravenous saline. The combination of heat, dehydration and an all-out effort had pushed his body to the limit.

Salazar's marathon career would never again produce quite the same kind of performance. His celebrated 1981 New York City Marathon victory had produced what was initially considered a world record, although the course was later found to be short. His Boston triumph therefore became one of the defining victories of his career.

Beardsley's story would take an even more difficult turn. Injuries disrupted his career, and after returning to the highest level, he suffered a devastating farm accident in 1989. Further accidents, surgeries and severe physical pain followed, eventually leading to a long battle with painkiller addiction.

He eventually overcame that struggle and transformed the darkest chapters of his life into a story of recovery, resilience and redemption.

That is what makes the 1982 Boston Marathon more than a two-second victory.

For one extraordinary afternoon, Salazar and Beardsley produced a marathon duel in which neither man was willing to give way. One crossed the finish line first. The other finished only two seconds behind him.

Two seconds separated them at Boston. Decades later, their legendary duel remains one of the greatest chapters in marathon history.