New research zeroes in on an unlikely culprit for why running gets less efficient as you fatigue.
Garmin and Apple are among a recent wave of companies who’ve entered the stress tracking market. Do the products live up to their claims?
Building buff digits might take less time than you think, according to the Spanish scientist
They're mighty comfy and don't have that sloppy sweatpants look
Build a better butt to carry you through any activity
Legendary gymnastics coach Christopher Sommer tells Tim Ferriss why all athletes benefit from a smarter approach to strength training
We asked a writer to spend one month going as hard as he wanted to—or didn't want to. Here's what he found.
The tennis superstar describes her favorite exercises and how she keeps a level head in tough moments, on and off the court.
Turn your hands into powerful tools
We’re a competitive bunch. Here’s how we stay fit enough to keep up.
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