🤔 The 10% rule is WRONG?


,

Hi runners,

Jessy here with newsletter #586! 🎉

Happy Saturday!

Here's what I have for you today
:

  • 👟 Hoka is known for the Clifton, its big, comfy (and surprisingly light) everyday trainer. But what about the rest of its lineup? Our shoe expert tried them all, and made a comprehensive video guide on which Hoka is best for you.
  • 🍫 Why elites are pushing the limits of ultra fueling—and what runners can learn from Roche’s record-breaking Leadville 100 performance
  • 🧃 Everything you need to know about hydration for runners to stay safe and perform at your best
  • 🏃‍♂️ Smart strategies to help you run stronger, smoother, and with less effort
  • 📈 Is what we know about the 10% rule wrong? Runners face greater injury risk from sudden long-run spikes than from weekly mileage increases, research shows
  • 🔥 WATCH: Our in-depth analysis of both the Chicago and NYC Marathon elite fields. Both races have super compelling storylines!

Get ready to get faster!

Jessy Carveth
Senior News Editor

🔥 WATCH: Which 2025 HOKA Running Shoe Is Right for You?

HOKA, one of the top running shoe brands in the world, has launched a handful of new shoes in 2025: sneakers tailored for easy runs, long workouts, races and more.

Senior Editor Alex Cyr tested HOKA's 2025 lineup, and provides his honest feedback for seven of its most popular shoes. Here, he explains what kind of running each shoe is made for, and what he likes and dislikes about every pair, to help you decide which HOKA model is right for you.

🍫 Leadville 100 Winner David Roche Details His Wild Fueling Strategy

The Leadville 100 is one of the most demanding races in ultrarunning, and this year David Roche delivered his best performance yet. The Colorado-based coach and ultrarunner crossed the line in 15:12:30, beating his previous best by 14 minutes.

Afterward, he shared a detailed breakdown of his fueling and hydration plan, offering a rare inside look at how precision nutrition can make or break a 100-mile effort at altitude.

🧃 Hydration For Runners: Everything You Need To Know

Staying properly hydrated can enhance your running performance—or derail it completely if you don’t get it right.

Too little, and you’re dragging through miles, dizzy, fatigued, and cramping.

Too much, and you’re dealing with stomach slosh or, in extreme cases, hyponatremia (we’ll get to this later).

🏃‍♂️ How To Make Running Easier: 10 Tips From Our Expert Coach

Some of us may be thinking, a guide on how to make running easier? Is that even possible?

As we train, we constantly improve, opening the door to push harder and harder during each workout. However, running shouldn’t be impossible every time you step onto the road or trail.

📈 The 10% Rule: New Study Suggests We’ve Been Doing It Wrong This Whole Time

For years, runners have been told to follow the 10 percent rule: don’t increase your weekly mileage by more than 10 percent, or you’ll end up injured. It’s been repeated by coaches, built into training plans, and even embedded into algorithms on GPS running watches.

But new research is calling that advice into question, and suggesting the real danger lies not in your weekly total, but in sudden jumps during individual runs.

🔥 WATCH: The 2025 NYC Marathon Features the Best Rivalry in Running

The 2025 TCS New York City Marathon is shaping up to be one of the most talent-packed editions in race history. New York Road Runners JUST announced that defending champions Abdi Nageeye and Sheila Chepkirui will return to the five boroughs on Nov. 2 to defend their titles, along with American record holder Emily Sisson. Molly Seidel is also making her return to competition after a two-year hiatus!

And perhaps best of all, NYC will see current Boston champ (and '22 NYC winner) Sharon Lokedi go head-to-head with '23/'24 Boston champ (and '23 NYC winner) Hellen Obiri, in what has become an extraordinary rivalry between these two American-based runners.

Watch our deep dive video on the women's and men's elite fields to get a full grasp of what will happen in NYC.

🔥 WATCH: Chicago Marathon 2025: Can John Korir or Jacob Kiplimo Go Sub-2? + Conner Mantz, American Record?

The 2025 Chicago Marathon elite fields are STACKED. We break down the biggest storylines: John Korir chasing sub-2:01, Jacob Kiplimo’s marathon potential, Conner Mantz’s bold shot at the American record, and the return of Galen Rupp.

On the women’s side, Magertu Alemu, Hawi Faysa, and Irene Cheptai headline a wide-open race shadowed by Ruth Chepngetich’s suspension. Plus, could Nike unveil a new super shoe (Alphafly 4)? Join us for predictions and analysis.

The Ultimate Runner's Bundle

The Ultimate Runner's Bundle combines all 4 of our premium courses (Half Marathon Masterclass, Marathon Training Masterclass, Ultra Runner's Playbook + 7 Day Motivation Challenge) in one cheaper package.

You get access to each of the below courses and all the bonus downloadable content - which adds up to over 16 hours of exclusive video tutorials and reams of extras: Check it out!

Use the discount code SPRINT25 at checkout for 25% off!


Looking for an online running coach? Whatever your goals, train with our managing editor, Coach Katelyn. Learn more about her online coaching.

Want to become a running coach? Check out our friends at UESCA. They do 100% online, at-your-own-pace coaching certifications for running and ultrarunning. More here.


Feedback? Hit reply and start a conversation with our team.

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