The host breaks down how the 2026 London Marathon became the first official race to break the 2-hour barrier — not with simple amazement, but with a deep, systematic analysis covering tactics (negative split), training cycles (10-day system), nutrition (including gut training), and shoe engineering. He also draws on the second-place finisher who went sub-2 in his marathon debut to trace how the sport is shifting from "a game of experience" to a science-and-technology-driven speed sport. The second half turns practical, covering the gear needed to manage body temperature, skin protection, and measurement accuracy in winter running, and the episode closes with listener comments and live chat interaction.

1. The Shock of the Official Sub-2 and the Direction of Today's Episode

The host opens with a Monday morning greeting, saying he hopes Running Radio makes your runs "a little more enjoyable." He then immediately brings up the biggest story: the news that the full marathon 2-hour barrier has, for the first time ever, been broken in an official race.

"Humanity has finally crossed the two-hour barrier in the full marathon… and it happened in an official competition, in a race where official times are certified."

He draws a clear line: this won't be the usual reaction ("amazing," "wonder what shoes he wore"). He's going to dig into how it was possible, scientifically.

"If you're just here for casual entertainment, today's content might not be for you. If you want to hear this in depth, systematically, and scientifically — pay close attention."

2. The Record: 1:59:30 — and a Sub-2 Debut

On April 26, 2026, at the TCS London Marathon in the UK, Kenya's Sabastian Sawe crossed the finish line in 1:59:30, setting what is described as the first officially recognized sub-2 marathon in human history.

"Sabastian Sawe, 1 hour 59 minutes 30 seconds… the first human in recorded history to break the two-hour barrier in an official race."

What follows is even more astonishing. Second-place finisher Yomif Kejelcha (Ethiopia) came in at 1:59:41, just 11 seconds behind, also going sub-2. The point that shocks the host most: this was Kejelcha's marathon debut.

"This was his first marathon ever. He went sub-2 on debut… an unprecedented achievement."

Third-place finisher Kiprimo of Uganda crossed in 2:00:28, surpassing the previous world record of 2:00:35. In other words, the top three all beat the old world record, and two of them went sub-2. The host says he was "dumbstruck" when he saw the news at work.

"Is this real?… How did this suddenly just… happen?"

He also notes that in the women's race, Tigist Assefa won in 2:15:11, setting a new women's solo-start marathon world record. He clarifies the difference between mixed-start records (where male pacemakers may help) and women's-only-start records, clearing up common confusion.

3. "Special Event" vs. "Official Race": How This Differs from Kipchoge's 1:59

The host references Eliud Kipchoge's 1:59:40 in Vienna in 2019 — a special controlled event. He explains that the conditions then included large teams of pacemakers, a laser guide from a vehicle, and a tight formation to reduce air resistance — a controlled environment that World Athletics refused to certify as an official world record.

"That was a controlled environment… massive pacemaker teams, a vehicle with a laser guideline… so it wasn't recognized as an official world record."

By contrast, today's London Marathon was run under standard competition rules in a competitive setting — "a completely different dimension," he insists.

"In a regular marathon race… under all the rules… a pure result. It's on a different level entirely."

4. The Tactical Core: Negative Split — Running the Second Half Faster

Here the host begins his deep dive into "the combination of tactics and science." The defining feature of this race, he argues, is the negative split (running the second half faster than the first). Conventional wisdom had treated even pacing as the gold standard, with the back half being about "surviving." Sawe flipped that.

"He ran with a negative-split strategy — actually running at a significantly faster pace in the second half."

He lists the splits explicitly, calling them "the moment marathon race logic was shattered":

• 5 km: 14:14 (avg 2'50/km) → projects to a 2:00:03 finish
• Half marathon: 1:00:29 (avg 2'52/km) → many observers thought the world record was out of reach at this point
• After 30 km, pacemakers dropped off; the lead group was down to Sawe and Kejelcha
• 30–35 km: 13:54 (avg 2'47/km)
• 35–40 km: 13:42 (avg 2'44/km)
• Final 2.195 km: 5:51 (avg 2'39.9/km)

He highlights especially that the second half (21.0975 km) was run in 59:01 — "the fastest second half ever run by a human being." He notes it smashed the previous best second-half split of 59:45.

"He keeps getting faster as the race goes on… He ran the second half in 59 minutes and 01 seconds."

He adds that this puts the gap to the half marathon world record (57:31) at just about 90 seconds — "an extremely aggressive acceleration tactic."

5. What Made the Negative Split Possible: The 10-Day Training Cycle

Moving to "how was this even achievable," the host introduces Sawe's coach Claudio Berardelli and his 10-day training cycle model. Standard training is designed around 7-day weeks, but this coach calculated that the balance between recovery and high-intensity work points to "not 7 days — 10 days," and restructured the cycle accordingly.

"Instead of weekly cycles, he built the training model on 10-day blocks — every training cycle is 10 days."

The approximate structure of a 10-day cycle:

1. Day 1: Ultra-long run (gravel to asphalt, 24–40 km). At least two 40 km long runs at near-race intensity (2:04–2:08 pace) in the lead-up
2. Days 2–3: Double days (morning 20 km + evening 10 km, 60 km across two days)
3. Day 4: Fartlek / short intervals (anaerobic stimulus)
4. Day 5: Recovery run
5. Day 6: Long intervals (18–25 km) to develop lactate threshold and late-race endurance
6. Day 7: Recovery run
7. Day 8: Hill sprints (steep 80m hill, 12–25 repeats)
8. Days 9–10: Back-to-back recovery runs → repeat from Day 1

The host notes the intensity was high, but the preparation was not without setbacks: signs of a stress fracture in the foot after his Berlin victory, and a back injury in December that forced a 10-day training stoppage. The coach "practically forced" Sawe to rest, then ramped intensity sharply from early February. The host pulls a lesson for everyday runners:

"Instead of training again the moment it feels a little better, make him rest completely — then push hard in the remaining time." "When things aren't right, forcing through training may be worse than resting fully and squeezing it in afterward."

He also mentions doping suspicions that inevitably surface, and how Adidas handles them by funding an ethics committee for random, ongoing doping tests, demonstrating transparency.

"Adidas pays every year to keep random doping tests going continuously… a way of showing it's clean."

6. Gut Training: Nutrition Science and 100g/Hour Carb Absorption

The host argues that the nutrition strategy contributed "significantly" to this result. He mentions the brand Maurten, framing what Sawe did not as simply eating gels but as building a "system."

The core claim: through gut training, Sawe pushed his carbohydrate absorption during intense exercise to 95–100g per hour. Normally, as blood flow concentrates in the muscles during hard effort, digestive function drops — going above 60–80g often triggers gastrointestinal distress.

"During exercise, blood flow shifts to the muscles, so digestion inevitably suffers… try to push past 100g and GI problems kick in."

Yet Sawe trained his gut so that as the race progressed, his absorption capacity actually improved — his body could accept 100g/h even at fast pace.

"Even as the pace accelerated in the second half, his gut absorption improved, and he built a body that could accept 100g per hour."

The delivery method was also not "a lot at once" but rather continuous intake of drink mixes every 15–20 minutes, combined with pre-race fueling 1 hour before the start to stabilize blood glucose and delay glycogen depletion. The result, the host concludes, is exactly what enabled the back-half acceleration.

"Stabilize early blood glucose… maintain steady blood glucose throughout the race… prevent glycogen depletion — and that's what made the negative-split tactic possible in the second half."

7. Shoe Engineering: 97 Grams and the "Energy Rim" Structure

Next, the host turns to equipment — shoes in particular. He mentions the model Sawe wore: the Adidas Adizero Adios Pro Evo 3 (he corrects himself a couple of times getting the name right). The first thing he emphasizes is weight: US size 9 at 97g — under 100 grams.

"97 grams. Under 100 grams."

For comparison, he cites the Nike Alphafly 3 at roughly 200g — nearly twice as heavy. He references research showing that every 100g of shoe weight saved improves oxygen cost by roughly 1% — and in a marathon, 1% is enormous. He also explains that lighter shoes reduce the moment of inertia (the burden of mass at the end of the lever that is your leg), reducing hip and knee stress and leaving more capacity to push hard in the final kilometers — a physics concept he frames as simply: "if the end of your leg is lighter, swinging it is far less tiring."

"As end-point weight decreases, the load on the hip and knee joints drops… leaving more drive capacity all the way to the end."

The midsole foam is 50% lighter than previous generations, he says, and the carbon plate/frame architecture has also changed. Instead of a full plate through the middle, the shoe uses a fiber frame running around the perimeter — the "Energy Rim" — which acts like an exoskeleton to control lateral stability while allowing the central foam to compress and rebound more fully, increasing propulsion.

"Placing it around the rim like a ring gives it an exoskeleton feel — stable… and the central foam can express its full capability."

He cites figures like "11% improvement in propulsion" and "1.6% improvement in running economy," then closes the section: the sub-2 was not the athlete's talent alone — it was tactics, training, nutrition, and shoes working in concert.

"The athlete's training method, tactics, nutrition, running shoes… all of it came together and produced the sub-2."

8. What a Debut Sub-2 Signals: A Paradigm Shift in Marathon Running

The host now shifts attention to second-place Kejelcha. "Second place was already astonishing — but sub-2 on debut" overturns established sports science consensus, he says.

"This completely upends conventional wisdom… the fastest debut performance in marathon history."

Traditionally, elite track runners transitioning to the marathon were expected to need years of adaptation — road conditions, distance, and rhythm require rebuilding the body. Yet Kejelcha held 1:59 pace through the 41st kilometer with virtually no road-race experience. An "unnervingly fast transition," he calls it.

He frames this as a paradigm shift. The old marathon rewarded experience and accumulated wisdom. The new marathon, he argues, is one where young athletes with overwhelming talent use cutting-edge science (shoes, nutrition, training systems) to go faster, sooner. Marathon running is becoming a speed race.

"In the past, experience and accumulated wisdom mattered most… now it's shifting to a race where young athletes charge ahead with the help of the most advanced science and technology."

9. Global Reaction and Debate: "Technology Doping" or Evolution Within the Rules?

Major outlets — the Guardian, BBC — led with the story. The host also mentions grief for the late Kelvin Kiptum, the previous world record holder. And fan communities, he notes, are debating whether a 97g shoe should be considered "technological doping."

"A 97g running shoe… should this be considered technological doping?"

He presents the counterargument too: the shoes passed World Athletics regulations (stack height, plate count, etc.), so there is no rule violation. But he explains why the debate persists: the marathon strictly limits things like course elevation drop and windbreak vehicles, yet shoe and nutrition advances — which have enormous impact — are comparatively loosely regulated.

"They won't certify a course with too much downhill… but for shoes and nutrition, there's effectively no limit. They've advanced so much that people are asking, 'is this right?'"

He closes the section with expert opinion that marathon running is no longer a simple endurance battle — it has become a race where athletes sustain near-lactate-threshold intensity using equipment and nutrition, essentially transforming into a long-distance sprint.

"Marathon is no longer an endurance battle… it has now become a long-distance sprint."

He ends with the note that "watching races will only get more exciting," and that following the athletes' backgrounds alongside the science makes the viewing experience much richer.

10. The Host's Take on Race Mindset: Don't Dwell on the Negative

After acknowledging that the sub-2 segment ran long, the host is candid about personal podcast realities: he can't cover everything perfectly, and sharp critical comments do appear. But he says he doesn't spend energy on them.

"If I get a sense of it… I don't read the rest of the comment. I block right away. That's better for your mental health."

He then extends this into a metaphor for race execution. If something goes wrong early — a tangled start, someone cutting you off, a burst of frustration — holding onto that negativity will ruin your second half. The ability to let it go quickly is crucial.

"There's no need to hold onto negative emotions all the way to the end… the faster you forget it, the better your second half will be."

11. A Complete Winter Running Gear Guide: Body Heat, Skin, and Measurement

In the regular "Running Encyclopedia" segment, the host covers "gear you need in winter." He has already discussed layering clothing in a previous episode; this time he focuses on non-clothing accessories. In cold weather, exposed areas — hands, head, face, neck, ankles — are the most vulnerable to heat loss, and small gear makes a big difference.

1) Gloves: Thin Layer + Windproof Shell

Gloves are his number-one winter running accessory. He recommends having a thin pair plus a windproof outer shell (like a mitten cover that goes over the inner glove) — together, these handle most temperature ranges.

"One thin pair, and one windproof shell to cover them from the outside… you can adapt to temperature changes."

For extreme cold below -20°C, he honestly recommends "just don't go out" — and if you do, keep it short.

"For that level of cold, I personally recommend not going outside."

2) Hat / Beanie / Ear Warmers: Heat Loss Starts at the Head

He notes that the head accounts for 10–15% of total body heat loss, making a beanie that covers the ears essential. A brimmed cap is useful for rain or snow. For very cold conditions, a thin beanie plus a thick beanie provides "double layering." If ears are particularly sensitive, ear warmers are another option.

3) Neck Gaiter: Breathability Matters More Than Warmth

The neck loses a lot of heat and needs covering, but a gaiter that's too thick or heavily fleece-lined traps moisture and can actually make you colder, he warns.

"It shouldn't feel warm when you put it on at home — it needs to feel warm while you're running. If it's scorching and trapping moisture from the start… it'll feel frozen later."

He recommends a breathable neck gaiter and names merino wool as an example material.

4) Hand Warmers: Factor In Cold-Weather Battery Performance

If gloves aren't enough for your hands, hand warmers can help. He cautions that rechargeable (lithium battery) warmers lose performance in severe cold, so keeping a powder-type (shake-to-activate) hand warmer as a backup is wise.

5) Emergency Cash / Card + Waterproof Zip-Lock Bag: Plan Your Exit

In winter, energy can drop or cold can set in suddenly, so he stresses always carrying emergency cash or a card. This is your "evacuation plan" — transit or a taxi home. Even a single 10,000-won note in a zip-lock bag is enough for peace of mind, he adds.

6) Vaseline: Creating a Skin Barrier, Not Adding Warmth

Vaseline doesn't raise body temperature — it protects skin from cold air and headwinds, reducing moisture evaporation to prevent chapping and cracking. Applied to thighs and underarms, it also prevents chafing from clothing friction. Useful in any season, he says, not just winter.

"It absolutely does not make you warmer… it serves as a protective barrier for your skin."

7) Chest Heart Rate Monitor: Wrist Optical Sensors Struggle in Winter

In winter, long sleeves cover your wrist, and the optical (PPG) sensor on a watch needs skin contact — fabric interference causes readings to drift. Using a chest strap heart rate monitor (e.g., Polar H10) synced to your watch solves this: the watch can be worn over clothing and heart rate accuracy improves.

"Wear the chest strap and sync it to your watch… you can wear the watch on top of your sleeve."

8) Wet Clothes After a Run Are Dangerous: Bring a Dry Change

Sweaty clothes plus wind after a run causes rapid body heat loss. If you're traveling any distance afterward, pack a dry change of clothes — at minimum a dry jacket or base layer. He shares from personal experience: he keeps dry clothes and a towel in his car in winter, and changing right after a run is "genuinely warm."

"Staying in wet clothes, your body temperature drops fast… change into something dry and you'll actually feel warm."

He closes the segment by advising first-time winter runners not to obsess over gear — use this as a season to stay safe and test what works for you. 🧤🧢

12. Listener Interaction: Comments, Race Reports, and Sign-Off

The final segment is devoted to reading listener comments and exchanging warm messages. Stories roll in: someone tuning in from vacation, someone excited about a half marathon in Australia (and envying the ticket transfer system there), a comment describing running as "dynamic meditation" that resonates with the host.

"Running is breathless and intense, but the inside is quiet… it's like a moving, dynamic meditation." "Your body is busy and tired, but your mind keeps getting calmer… that's the charm of running."

Live chat greetings are read out by name with warmth. Weekend race participants — ultras, 10Ks — share brief recaps. One story about a race where the timing chip recording failed gets an empathetic response, followed by encouragement to frame even that as "a memory."

The host closes by acknowledging that today's sub-2 discussion ran long — then thanks the listeners who stayed through it all and announces he'll be back the next morning at 6 a.m.

"To every runner who joined me on Running Radio today — thank you sincerely… I'll see you again tomorrow morning at 6."

Closing

This episode dissects the 2026 London Marathon's official sub-2 not as "one athlete's miracle" but as the convergence of tactics (negative split), a 10-day training cycle, a nutrition science that included gut training, and shoe engineering. At the same time, a debut sub-2 performance signals that marathon running is increasingly becoming a technology-driven speed sport. The practical segment then delivers an actionable, dense rundown of winter running gear, skin protection, and post-run thermal management — weaving the historic performance story and the everyday runner's tips into a single episode.