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This article is purely theoretical. Some readers will think that the theory is obvious on its face, and others will think that it's wrong. The joy of talking about training theory at the intersection of science and anecdote is that there are too many physiological metrics to track, and too many variable responses to interventions, so the resulting conclusions fall somewhere on the spectrum between fundamental truth and biased bullshit. Throughout, I'll try to check my biases and acknowledge the unknowns.

You know I'm nervous about writing an article when the first paragraph is undercutting myself with disclaimers. To be fully real with you: I am unsure on this one. 

This article tries to articulate an unexpected observation that now forms a cornerstone of my coaching approach, but I have too much self-doubt to ignore my biases. It's like looking at a diagram of constellations in the night sky. The diagram might say: "This is the mighty hunter, pursuing the courageous bear." 

So remember, as I try to break this down, I'm describing a scene with a mighty hunter, but I'm painfully aware it might just be dots and a phallus. 

Here it is, distilled down to 3 sentences:

Output at VO2 max while climbing (measured via grade-adjusted pace) may have a high predictive value for athlete progression and regression over time, particularly with age. 

The metric likely is a proxy variable for limitations of mechanical output that are faced by some athletes from the start of their running journeys, and confronted by all athletes with age. 

Constant reinforcement of the metric may improve performance at all effort levels, including long ultras, and can seem to reverse the athletic decline process in some cases.

That's it. To paraphrase The Lion King: Simba, let me tell you something that my father told me. Look at the stars. YOU SEE WHATEVER YOU WANT TO SEE.

Observations From Athlete Training

Let's have some fun with training theory, reverse-engineering why I think this conclusion is significant and may be overlooked. When my co-coach/wife Megan and I started coaching (we talk about this topic more on episode 114 of our podcast), we began as acolytes to coaches like Renato Canova and Jack Daniels who excelled with Olympic-level athletes on the road and track. 

We added some wrinkles here and there based on data we saw along the way, which seemed to especially manifest themselves with athletes that might not have Olympic-level VO2 maxes, whether due to genetics or age (VO2 max measures peak oxygen utilization during exercise, has a strong genetic component, declines with age, and is not highly trainable). You have probably seen me write about a lot of those wrinkles: plenty of fast strides, a higher proportion of short yet controlled intervals, and the heavy use of hill intervals year-round.

But Megan and I both kept hitting the same stumbling block: athletes over age 40 just didn't respond as well as we would like.

So we tried something new. With sub-ultra trail runner Mark Tatum and a few other athletes, we moved almost every workout into the hills, with an astounding number of power hill strides, and at least one session most weeks with short hill intervals. Mark and some others had breakthroughs, seemingly giving a big middle finger to the aging process. For Mark, a few years of training later, it led to an overall win at the Dipsea Race.

That made sense with aging athletes. Hills reduce impact forces and may increase muscle recruitment/mechanical demand (2017 review article in Sports Medicine), and short intervals may counteract natural VO2 max reductions, so they are great for the aging athlete. I've written about that before, as have others. It was nothing new, although maybe the approach was more committed to the bit.

But then something fascinating happened. A few younger athletes that we coached also seemed to have issues where traditional speedwork didn't lead to the expected adaptations. Maybe it was repeated injury cycles without clear explanations, or maybe it was just an unexplained performance reduction. So we tried a similar intervention. While results varied, the hill emphasis had a substantial effect size on results in our team, including preceding a couple national championships.

Now we were intrigued. Is it just the specificity of hills for trail running? Possibly, but we saw similar improvements in some road runners. Could it be an improvement in the VO2 max variable? That's doubtful, since there's little evidence that it can increase much in trained athletes. Lower injury rates? That likely plays a big role, but later we started to see similar results in athletes who rarely got injured. Or, to summarize: The hunter, or a random association of dots?

As we started to incorporate short hills more for all of our athletes, with all different backgrounds, we started to hone in on one primary explanation: the unique neuromuscular and biomechanical demands of mechanical output in running.

Here, mechanical output is shorthand for how aerobic processes interact with the musculoskeletal, biomechanical, and neuromuscular systems to create speed. A thorough explanation of mechanical power output is in this 2018 article in the Journal of Biomechanics, but just think of it as how each stride transmits force, rather than as conveying everything that goes with the technical term. For our purposes, effort level at VO2 max does not refer to the specific physiological measure, but is a general shorthand for high-yet-controlled outputs.

We have seen that if an athlete can improve their output around VO2 max on hills, they can counteract - even reverse - part of the athletic aging process at all distances. The reason that the short hills should lead to more broad-ranging development is that athletes accumulate lots of aerobic work over time, and those lower-level aerobic gains accumulate. 

There is nothing new about this concept. For example, Norwegian training principles are so hot right now. Most of the focus is on the high volume of threshold work. But if you look closely at some of the sample weeks, you'll sometimes see a day full of short, fast hills (and that's for young, immensely talented athletes). Similar concepts were rumored to be included in the training of Jake Wightman, World Champion in the 1500 meters. Whether it's Lydiard-based systems from the 1960s and 1970s, Canova-inspired hill sprints, or hybrid approaches, once you start looking, you'll see these elements all over, even for athletes that seem to have almost no genetic or age limitations.

Possible Physiological Explanation

Okay, let's go back to first principles. VO2 max peaks at a young age, and it isn't highly trainable. So how do athletes keep getting faster if their peak oxygen intake is staying flat or declining? 

The answer is that their output at VO2 max improves, usually measured as velocity at VO2 max, even as the denominator doesn't improve. The prototypical example is Paula Radcliffe (see this 2006 study in the International Journal of Sports Science & Coaching), whose VO2 max actually decreased from when she was a champion junior athlete, but her running economy (the amount of energy she used to run fast) improved by 15 percent. Those running economy improvements likely come from some mix of lower-level aerobic development leading to more efficient cellular processes of fatigue management, neuromuscular/biomechanical efficiency, and mechanical output. I'm not concerned with how much oxygen an athlete can consume, but what they do with the oxygen they have.

Running economy can be measured across multiple intensity levels. At the intense end of the spectrum, you have velocity at VO2 max (think 10ish minute effort, with variance). More toward the middle is critical velocity or velocity at lactate threshold (~30- to 60-minute effort). At the easier end of the spectrum is velocity at aerobic threshold (2-3+ hours, depending on the athlete). With age, vVO2 goes down first (often in an athlete's mid-20s), followed by vLT (30s or later), then vAeT (which can stay higher for a long time due to the aerobic component). That makes intuitive sense-athletes move up in distance with age by necessity as VO2 max and mechanical output go down, while long-term aerobic development is ongoing. 

Side note: there are 10 statements in the preceding paragraphs that are controversial in exercise physiology. Sorry about that. If there's anything I learned from eating a lot of cereal as a kid, it's that if you spot them all and mail proof of purchase to General Mills, they might send a free toy!

Back to it. Our theory is that focusing too heavily on the aerobic side of the running economy equations misses out on the mechanical power side. Yes, VO2 max will decrease with time. But based on what we have seen, the mechanical output associated with VO2 max doesn't need to decrease much at all. And it can even go up very far into an athletic journey!

Mechanical Limitations

Why is that significant for an athlete competing in longer races? Think back to the experienced 60-year old athlete who progresses a bunch with short hill intervals. Their VO2 max number likely can't change much at that point of their athletic journeys, but we think that their mechanical output can. And because mechanical power is a strong performance indicator at all efforts in aging athletes, it doesn't matter that the short hills are non-specific to their race distances. It's the highest-yield stimulus for output, and it pushes back the strongest against the inertia of aging, so they get faster at everything.

If you're 50+, I think that you can take that to the bank. Focus on mechanical output/strength alongside aerobic development, and you'll be rich as hell. Now, let's dive into a more speculative investment. 

The hardest logical leap is to take these principles and apply them to younger athletes. Why might they progress even when they aren't limited by mechanical output in the same way?

Our theory: they are limited in that same way, just to a less clear extent. In fact, most of us have some mechanical limitations that are semi-independent of traditional aerobic development.

Talented, elite athletes are the origin point for many training theories, and most of those athletes have few limits associated with vVO2-that's why they're elite in the first place. So they can focus more heavily on the aerobic-input components of speed, plus specific training for their events. But for most of us, mechanical power at the top-end of aerobic capacity is a limiter from when we are young, and it only gets worse with time. 

That's one reason we strongly encourage athletes to eat enough, always. Running is a power sport, even if it doesn't always feel that way. And that may add another explanation of why athletes who restrict food almost never improve over time.

Theoretical Implications

Since mechanical output is the true theorized limiter, it may be better to do many of the sessions targeting it on uphills. Flat intervals are fantastic and important at times, but many athletes end up not having the biomechanical and neuromuscular efficiency to translate their aerobic ability into the same output. In our data, an athlete who is not extremely fast (in a road/track sense) will often have a faster grade-adjusted pace on a 2-minute hill interval than pace on a 2-minute flat interval, often by 20-30 seconds per mile. Combined with the higher muscular demand and lower injury risk, output around VO2 max seems to be optimized on hills. 

A quick disclaimer: we could easily be confusing cause-and-effect here. Perhaps it's all driven by reduced injury rates and lower soreness levels, creating more consistency over time (or any other explanation you can think of). Going backwards from outcome to mechanism is problematic for 99 reasons, and for the strength of this theory, each and every one of them is a bitch.

But the practical takeaway is this: we have seen that if an athlete can improve their output around VO2 max on hills, they can counteract - even reverse - part of the athletic aging process at all distances. The reason that the short hills should lead to more broad-ranging development is that athletes accumulate lots of aerobic work over time, and those lower-level aerobic gains accumulate. 

The aerobic system can continue to improve, but for many athletes, it runs into a ceiling that we think is often set by mechanical output. If you raise that ceiling, there can be a positive feedback cycle where improved mechanical output allows the improving aerobic system to translate to better running economy, which improves mechanical output more, and so on.

The Big Takeaway 

Don't let your mechanical output be too strong of a limiter, no matter what training approach you use. For us, that involves three main elements. 

First, athletes do hill strides year-round to encourage max power development. That can be as simple as 2 sessions of 4-6 by 20-30 second fast hills in the 2nd half of runs each week, or adding hill strides after a flat workout. Or it can be bigger, dedicated sessions like in the Norwegian training sample weeks. Flat strides can also work for this purpose, particularly for advanced athletes. 

Second, athletes periodically do moderately hard hill intervals, as often as weekly for aging or injury-prone athletes, and as little as every 6 weeks in durable track or road athletes (with other sessions being on flat or rolling terrain). Our usual guideline is 12-20 minutes of total intervals, with each interval being 3 minutes or less with run down recovery between them. Simple go-to examples are 16-20 x 45 seconds, 8 x 90 seconds, 6 x 2 minutes, or 5 x 3 minutes, though you can get creative with it based on what's the most fun for you. Mix up the gradient, with the sweet spot being 8%, but it's cool to have fun with steeper or shallower grades, too. 

Third, do strength work. We are partial to Mountain Legs and Speed Legs, but anything that improves your strength can work. Just avoid overdoing it.

And remember: this is just one element of our training theory, and our training theory is a grain of sand on the beach of training theories that are out there for free on the internet. Even for us, it interacts with hundreds of other concepts. Listen to your body and do what works for you. Ignore this if you disagree. Send all of your complaints to General Mills.

But don't accept that getting weaker is a foregone conclusion. Aging is inevitable. If you zoom out far enough, slowing down is inevitable, too. But slowing down is not inevitable tomorrow or next year. And I think there's a strong argument that it's not inevitable 5 or 10 years from now either. What do we say to 

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.