What Does Your "Threshold" Really Mean?
After half a century of confusion, researchers have a new perspective on the transition from "aerobic" to "anaerobic" exercise
Training & Performance
How Does Your Brain Respond When You Hold Your Breath?
When you stop breathing, oxygen flowing to your brain actually increases—at least for a while
The One Full-Body Move You Should Master
Avoid these mistakes and master the complex full-body movement
Rethinking the Cross-Training Paradox
A basic principle of training says you get better at the things you do most. So why does cross-training work?
How to Strength Train with Lower-Back Pain
Five gentle weighted moves to help you progress over time
We Now Have the Lab Data on Nike’s Breaking2 Runners
To pick their two-hour marathon team, researchers tested some of the greatest runners on the planet. Now they're revealing what they found.
Train Your Core with Jessie Diggins's Killer 8-Minute Workout
Bust your gut like the gold-medal-winning cross-country skier
To Strength Train Right, Trust Your Feelings
You don’t need an elaborate workout plan to get the most out of your resistance workout; you just need to tune into how you feel
Scientists Weigh in on the Great Trekking Pole Debate
A new review sifts through the evidence for and against hiking with poles
How Your Muscle Fibers Might Predict Overtraining
A new study suggests that slow-twitch runners can handle higher mileage than fast-twitch runners before showing signs of overtraining