In addition to heart rate monitoring, elite athletes and biohackers of the future will be rigorously testing their cortisol.

Olympian Shadrack Kipchirchir won the USA Track & Field Championships in January 2022. Here's what happened to his body on race day...

Hydration has a little-known perk: stress relief. In fact, research shows it can even boost your overall mood. Read on to learn more.

As Olympian Shadrack Kipchirchir put it: “Either you get up or stay down.” Shadrack couldn’t be a better example of how to get back up...

Here's a behind-the-scenes look at some of the research comparing HRV and cortisol testing. And how these tools can improve your training.