Conventional wisdom says that drafting doesn’t matter when cycling up steep hills. It’s wrong.
Kaitlyn Boyle smashed the women's record for the AZT300, while Kurt Refsnider reclaimed the record for the 760-mile AZTR
Pain psychologists explore the differences between those who finish ultra-endurance races and those who don't
New research explores how ultraviolet light can trigger the production of health- and performance-boosting nitric oxide
On Saturday, the pro ultrarunner skinned and skied a combined 61,200 feet in 24 hours, setting a record for the most vert in a single day
It's the most reliable performance booster in the world—unless you have the wrong genes
Scientists make the case for a new real-time measure of endurance effort
Athletes have been shattering "expert" forecasts for the ultimate limits of our species for more than a century
Good fitness is about more than just powerful legs and core
In an exclusive excerpt from his new book, Outside’s Sweat Science columnist explores the brain’s role in setting our physical limits.
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