Is It More Important to Run Faster or Run Longer?
Scientists debate the physiological benefits of ramping up your training intensity or your training volume
Endurance Training
Archive
Mirna Valerio Is the Runner You Never Expected
When Mirna Valerio first began running ultramarathons, she immediately got a lot of attention—but not for the reasons you might expect
What You Need to Know to Avoid Altitude Illness
Experts from the Wilderness Medical Society have combed through the evidence to assess what works and what doesn’t
Jim Walmsley Broke Another Western States Course Record
Walmsley just bested his own time by an impressive 20 minutes
Did Scientists Really Find a Speed-Boosting Microbe?
A lactate-munching microbe found in the poop of Boston marathoners is interesting, but that doesn’t mean you should (ahem) swallow it just yet
Karl Egloff Just Beat Kilian Jornet's Denali Record
The Ecuadorian-Swiss climber set a blazing-fast time on North America's highest peak—besting the previous record, set by rival Kilian Jornet in 2014, by one minute
What Kara Goucher Learned from the Leadville Marathon
The elite marathoner wants you to know that trail runners deserve our respect
The Story of the Cyclist with the Highest-Ever VO2max
A newly published scientific case report documents the rise (and fall) of cycling phenom Oskar Svendsen
The Beginner's Guide to Open-Water Swimming
Build confidence and skill before your first big dip
What’s New in Hydration Research
Hydrogels, electrolytes, and drink frequency top the list at this year’s ACSM conference
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