10 Commandments of Fitness

Don’t let the Theranos saga fool you: we’ve entered a new era of self-quantification, in which on-demand blood testing is sold as the easy way to fine-tune your training and nutrition. Can an algorithm really replace your coach?

Taking control of your health is easier than ever

Indoor rolling on a bike trainer used to be a heinous chore. Now there's an app that turns it into a video game—and puts you on a fast track to aerobic fitness.

Being fit is about constant movement, and children are in constant motion during playtime at the jungle gym. Why not join their lead?

New research shows that perceptions of fatigue and pain stop us from hitting our physical limits long before our bodies do. Can athletes train their brains to reach unheard-of levels of peak performance?

Your mind is also key to recovery

Move the dial with the power of science

These neuron-stimulating Halo Sport headphones are said to boost athletic performance

The diet has quietly become the rage among ultra-endurance athletes and elite soldiers, and it's a surprisingly yummy way to fuel up.

How endurance athlete Patrick Sweeney puts away nearly 3,000 calories a day on the ketone diet

Want to perform like a pro, even with the years piling up? Nick Heil got the deluxe treatment at Exos, a cutting-edge outfit that works with NFL players and soccer stars. He came out slimmer, stronger, and more focused—the perfect upgrade for anybody, at any age, who plays hard in the outdoors.

Two weeks of full-time, one-on-one instruction at Exos can set you back $4,800. Here’s how to get many of the same performance benefits without taking out a second mortgage.