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Join 18,238 Runners Using Science to Run Your Fastest Marathon

Each week, I share FREE tips to help you run your fastest marathon.
Science-backed.

Save 2,000+ hours of research with 4-minute guides.

Written by
Jonah Rosner - Former NFL Sport Scientist

Most Popular Guides

Why Your Heart Rate Stays High—And Why Spiking It Beats Endless Zone 2

Nov 27, 2025

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12 min read

Why Your Heart Rate Stays High—And Why Spiking It Beats Endless Zone 2

The Mile 20 Caffeine Mistake That’s Costing You Minutes—And How Pros Avoid It

Nov 13, 2025

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10 min read

The Mile 20 Caffeine Mistake That’s Costing You Minutes—And How Pros Avoid It

Your Post-Run Electrolyte Drink Might Be Useless (and What Actually Works)

Nov 6, 2025

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10 min read

Your Post-Run Electrolyte Drink Might Be Useless (and What Actually Works)

90% of Your Runs Don’t Need Electrolytes—Here’s When They Actually Matter

Oct 30, 2025

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10 min read

90% of Your Runs Don’t Need Electrolytes—Here’s When They Actually Matter

Why You Don’t Need Electrolytes—And When They Actually Matter

Oct 24, 2025

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11 min read

Why You Don’t Need Electrolytes—And When They Actually Matter

🏃‍♂️ Could Running Less During Your Taper Be the Secret to Your Fastest Marathon Yet?

Oct 17, 2025

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10 min read

🏃‍♂️ Could Running Less During Your Taper Be the Secret to Your Fastest Marathon Yet?

VO2 Max Drops in 12 Days?! How to Keep 90% of Your Fitness After Your Marathon

Oct 9, 2025

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12 min read

VO2 Max Drops in 12 Days?! How to Keep 90% of Your Fitness After Your Marathon

Free Speed: How to Use Caffeine to Shave Minutes off Your Marathon

Sep 25, 2025

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9 min read

Free Speed: How to Use Caffeine to Shave Minutes off Your Marathon

Why Your $500 Smartwatch Keeps Lying During Intervals—and the Fix

Sep 18, 2025

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11 min read

Why Your $500 Smartwatch Keeps Lying During Intervals—and the Fix

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