Endurance Training

Jeff Lenosky's World-Record-Breaking Training Tips

Jeff Lenosky travels the U.S. knocking out mountain biking's toughest trails. Here's how he stays fit.

Here's How Muscle Memory Works

Scientists are untangling why it’s easier to regain fitness than to start from scratch

Kilian Jornet Breaks the 24-Hour Uphill Ski Record

The Spaniard posted an absurd 78,274 feet

Using Pain to Reach Your Potential

Former Navy SEAL and endurance athlete David Goggins insists that discomfort is the key to self-improvement

How to Harness Pre-Run Anticipation

Researchers explore how your brain chemistry may start dulling pain and boosting mood before you even take a step

A Post-Workout Soak Might Boost Performance

New research confirms that a week of hot tub sessions helps your body adapt to heat

Why Mountains Make You Dumber

We know that cognitive function is impaired at high altitude, but it’s not entirely clear why

10 Times We Redefined Human Limits in 2018

Here are the most jaw-dropping accomplishments of the year

Reboot Your Fitness

The Most Valuable Training Data Is Surprisingly Simple

Research on a pro cycling team suggests that subjective training metrics can match high-tech ones