Why low vitamin or nutrient levels could be at the root of your extreme fatigue, soreness, and performance decline.

In The Runner’s World Guide to Nutrition and Fueling, Runner’s World exclusive program led by run coach Mireille Siné and guided by experts, you’ll learn strategies on how to better listen to your ...

Jepchirchir, 32, has won three of the seven World Marathon Majors, including London (2024), Boston (2022), and New York City ...

The French athlete ran the fastest time in race history to earn her first UTMB title over Americans Rachel Entrekin and Emily ...

This story will be updated as the elite runners finish. Here are the results from the 2026 Sydney Marathon.

Ben Dhiman of the United States buried the field to win the men’s race at the 2026 Ultra-Trail du Mont-Blanc trail race in ...

The Cincinnati native won the race by more than 30 minutes and became the second American man to claim the title.

Dehydration: It triggers physical and physiological stress on the body by forcing organs to work harder. When it comes to the ...

Simpson revealed she was diagnosed with a rare heart condition after her heart stopped during a community mile race. She says ...

Easy runs, by definition, should be laid-back. You shouldn’t be huffing and puffing or stressing about your speed. It can be ...

Winnie Yu, PT, DPT, CSCS, you’ll find the best exercises for improving your running abilities. (Watch the How To Master Main ...

Learn how each macronutrient supports your energy and recovery—plus how to adjust your intake as your training changes.