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Hi runners, Jessy here with newsletter #610! 🎉

Happy Saturday! ​
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Here's what I have for you today:

• 🇩🇪 The 2025 Berlin Marathon is right around the corner. Here's everything you need to know!
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• 👀 100m world champion Fred Kerley turns away from track’s establishment amid doping rule controversy and joins Enhanced Games.
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• 🏃‍♂️ Discover when the 10% rule works, when it doesn’t, and how to build your mileage the smart way—based on your body, experience, and goals.​
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• 🤔 Eyewitnesses say a videographer followed Matt Choi on a one-wheel board, handing off bottles during the race...and some people aren't happy.
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• 🚀 Unlock the power of structured speedwork to improve your pace, endurance, and race-day confidence.
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• 🏃‍♂️ WATCH: Should You Run While Injured

Get ready to get faster!

Jessy Carveth
Senior News Editor

​🇩🇪 Everything You Need To Know About the 2025 Berlin Marathon​

The Berlin Marathon is built for speed, long, straight boulevards, gentle turns, cool late-September air, and a finish that sweeps you through the Brandenburg Gate with a roar from the grandstands.

On Sunday, 21 September 2025, the world’s fastest marathon course hosts its 51st edition, and the fields suggest Berlin’s reputation as a record magnet isn’t going anywhere.

​👀 Fred Kerley Becomes First Track Athlete to Join Enhanced Games​

Fred Kerley, one of the fastest men in history, has become the first American Olympian to sign with the controversial Enhanced Games, weeks after being provisionally suspended by the Athletics Integrity Unit (AIU) for whereabouts failures.
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The decision marks a dramatic pivot in the 29-year-old’s career, and a shot across the bow for the traditional track and field establishment.

​🏃‍♂️ The 10% Rule: Is It a Valid Way to Increase Your Weekly Running Mileage?​

In the running world, the 10% rule is similar to the Golden Rule. It states that you should never increase your mileage by more than 10% per week.

The trouble with the 10% rule is that it’s not based on scientific data and is not appropriate for all runners. Runners come from all different backgrounds and experiences, and so there is hardly ever a one-size-fits-all approach.

​🤔 Marathon Investigation Targets Matt Choi’s “Mobile Aid Station” Cameraman​

Matt Choi, the marathoner and influencer whose racing has been repeatedly overshadowed by controversy, is again under scrutiny after his appearance at this month’s Marquette Marathon.

Photos and firsthand accounts suggest that Choi was accompanied not just by a videographer, but by what amounted to a rolling support crew weaving in and out of the race on a one-wheel board.

​🚀 Your Complete Guide to Interval Running + 6 Speed-Boosting Workouts​

Much like any form of high-intensity interval training, interval running workouts involve bouts of running at a higher intensity, such as your race pace or VO2 max pace, and then taking a short recovery period before going hard again.

Here's how to get interval training right to boost your performance.

​🏃‍♂️ WATCH: Should You Run While Injured​

QUICK SPRINTS

• ​The 7 Best Plyometric Exercises For Speed
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• ​How To Start Trail Running: 6 Tips For Beginners To Get Going
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• ​Everything You Need To Know About Running With Gels​