How Caffeine Boosts Endurance
A new twist in the old debate about caffeine's performance-enhancing powers suggests it helps maintain oxygen levels in the blood
Author
Alex Hutchinson
Alex Hutchinson is Outside’s Sweat Science columnist and the author of Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance. He lives (and runs) in Toronto.
My Stories
An Unconventional Training Idea for Older Women
Mounting evidence suggests that women respond differently to endurance training after menopause. Could donating blood be the solution?
How Pregnancy Affects Your Marathon Time
A new study assesses how childbirth altered the career trajectories of the fastest marathoners in history, with encouraging results.
Do Endurance Athletes Get More Cavities?
The oral health risks associated with heavy sports-drink use seem clear, but the evidence remains murky
Long Runs Train Your Heart, Sprints Train Your Muscles
Different workout styles can get you equally fit, but they affect your body differently—which suggests that you should mix it up