Our resources and updates
Your resting heart rate is one of the simplest markers of cardiovascular fitness. Here's what actually moves it, from training habits to what you do in the hours before bed.
HRV is one of the best markers of recovery and autonomic health. Here's what actually moves it, from training to sleep to what you do in the hours before bed.
Sleep is more than hours in bed. Here's how Zenith calculates what you actually need, tracks what you got, and shows you the debt you're carrying.
Recovery is a single score that tells you how ready your body is to train. Here's what goes into it and why it sometimes disagrees with how you feel.
Strain is the single number that tells you how hard your day was. Here's how Zenith calculates it from your heart rate, your lifting, and everything in between.
Zenith Wellness 
