After years of interviewing athletes and entrepreneurs, human guinea pig Tim Ferriss has a few tricks up his sleeve, including AcroYoga, Instagram hacks, and, um, a stress-relieving vibrator. By Tim Ferriss
The era of personalized blood testing is here. But does all that data lead to information overload? By Peter Andrey Smith
Plus: Take charge of your own health.
Upgrade: New tech that gathers your stats.
Ignore Your Limits
We had six rookies plunge deep into caves, swim the open ocean, and strike ballet poses (seriously!) to prove to themselves—and you—that anything is possible.
Doctors have used the high-fat ketogenic diet to treat epilepsy for decades. Now athletes are tapping into its high-energy benefits. Are you ready to love sardines? By T. J. Murphy
Plus: Make fat work for you.
Never Give Up