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Yesterday, the 130th Boston Marathon took over the running world. More than 30,000 runners from 123 countries lined up from Hopkinton to Boston, and Sharon Lokedi defended her title in 2:18:51. That matters. Not because we need more Boston content today—but because big races always bring a fresh wave of supplement hype.

So let’s be clear:

This is not one of those “take this and you’ll PR will crush” emails.
And I’m not here to help you justify an expensive powder because the packaging looks fast 🤣.

I want to show you the difference between evidence and marketing.

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Endurance Mindset en Español (¡Ya disponible!): desde cero al maratón, con ciencia y estructura. Compártelo o regístrate y forma parte desde el comienzo. 🏃‍♂️📩 ¡Registrarme!

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What actually works

A small group of supplements has real support in sport science when used correctly: caffeine, creatine, nitrate/beetroot, sodium bicarbonate, and in some contexts beta-alanine. The IOC consensus and the AIS framework both make the same broader point: a few supplements can help in specific scenarios, but most products do not meaningfully improve performance. (Maughan et al., 2018; AIS, 2021)

For endurance athletes, caffeine has the strongest and most consistent evidence, especially around aerobic performance, with common effective doses around 3–6 mg/kg. (Guest et al., 2021)

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Post of the week In an epic performance, John Korir shattered the Boston course record with a stunning 2:01:52, marking the fifth-fastest marathon in history. Read article

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What to do with that

Stop asking, “What supplement should I buy?”

Ask:

• What problem am I trying to solve?
• Is this product evidence-based or just popular?
• Does it fit my event, dose, timing, and tolerance?

Most athletes need better sleep, better fueling, and better execution before they need another tub on the shelf.

👉 Read the full article​

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What best describes your current supplement approach? I keep it simple ☕ I’ve tried a lot of products 🧃 I only use race-day basics 🏁 I honestly don’t know what works 🤔

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🚀 The Weekly Scout: Gear & Elite Performance

• 🚀 NIKE PEGASUS PREMIUM: THE "VISIBLE AIR" PERFORMANCE LEAP
  ​Following its recent launch, the Pegasus Premium is dominating conversations this week in Boston. Unlike the standard line, it features Nike’s first sculpted, visible Air Zoom unit that contours to the natural shape of the foot. Scientifically, this provides a more efficient transition from heel to toe-off, returning more energy than any previous Pegasus model. It is positioned as the ultimate "Super Trainer" for athletes who want Alphafly-like spring in their daily miles.
  • The Verdict: Real Innovation. It’s the most aggressive daily trainer Nike has built, blurring the line between training and racing technology.

• 🚀 ADIDAS ADIZERO ADIOS PRO 4: THE "BOSTON 2026" DEBUT
  ​Yesterday morning at the Boston Marathon, several top elites were spotted in the highly anticipated Adios Pro 4. The shoe features a refined Lightstrike Pro foam density and a new "rocker" geometry designed specifically to reduce quad fatigue during the aggressive downhill sections of the Newton hills. Early data suggests a significant reduction in muscle oscillation compared to the Pro 3.
  • The Verdict: Elite Performance. This shoe is engineered for "course-specific" resilience, proving that super-shoes are now being tuned for specific marathon topographies.

• 🚀 LATAM ELITE: THE "BOGOTÁ ALTITUDE PROTOCOL" SUCCESS
  ​News from the high-altitude camps in Colombia confirms that top LATAM marathoners are utilizing a new "Intermittent Hypoxic Training" protocol. By combining 2,600m (8,000ft) base living with sea-level intensity sprints (simulated via oxygen masks), athletes have shown a 3% increase in hemoglobin mass without the usual overtraining fatigue. This protocol was instrumental for the LATAM contingent's strong showing in recent spring races.
  • The Verdict: Trend Alert. LATAM is becoming a global hub for scientific altitude training, rivaling East African camps in sophistication.

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What's Going On in the World of Running?

1. The Korir Coronation: A Course Record for the Ages

History wasn't just made today; it was obliterated. Kenya's John Korir has successfully defended his crown at the 130th Boston Marathon, but he did so by clocking an unofficial 2:01:52. This isn't just a win; it is the fastest marathon ever run on the iconic (and notoriously difficult) Boston course, breaking the previous record by over a minute. Korir ran virtually alone from the 30K mark, crushing the Newton hills with a pace that suggests he is currently the most dangerous marathoner on the planet.

• Reference:Olympics: John Korir Shatters Boston Course Record​

2. Lokedi’s Back-to-Back Brilliance

In the women's elite field, Sharon Lokedi proved that her 2025 win was no fluke. She became the first woman since 2005 to win back-to-back Boston titles, finishing in a powerful 2:18:51.While she fell just short of her own course record from last year, her tactical dominance in the final miles left the rest of the field—including runner-up Loice Chemnung—scrambling in her wake.

• Reference:Marathon Handbook: 2026 Boston Results - Lokedi Goes Back-to-Back​

3. The American Record Shift: McClain and Talbi Shine

While Kenyans swept the podiums, American fans had plenty to cheer for. Jess McClain delivered a masterclass in grit, finishing 5th overall and setting a new American Course Record for Boston with a time of 2:20:49.On the men's side, Zouhair Talbi (representing the US) also secured a 5th place finish in 2:03:45, the fastest time ever recorded by an American on this specific course. The "Atlanta Three" controversy from last month seems to have fueled a fire in the US distance squad.

• Reference:FloTrack: Talbi and McClain Set Landmark American Marks at Boston​

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[BIGGEST_CHALLENGE GOES HERE]​

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Don’t confuse consumption with commitment. Build your performance on what is proven, not what is promoted.

Coach Henri.
​Your Endurance Mindset Team

Pray 🙏 - Love ❤️ - Run 🏃‍♂️ ​​​​​​​

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References (on this Email)

Australian Institute of Sport. (2021). AIS Sports Supplement Framework position statement.
Guest, N. S., VanDusseldorp, T. A., Nelson, M. T., et al. (2021). International society of sports nutrition position stand: caffeine and exercise performance.
Maughan, R. J., Burke, L. M., Dvorak, J., et al. (2018). IOC consensus statement: dietary supplements and the high-performance athlete.