Primal Endurance

This is a good indicator to take it easy until you generate baseline HRV numbers.

WHY HRV IS BETTER THAN RESTING HEART RATE TO MONITOR STRESS AND RECOVERY

Essentially, it took thirty-six hours for the fatigue to set in and register with a nosedive HRV score,

But your main concern should be tracking your own baseline over time, and making sound training and lifestyle decisions based on daily values that depart from baseline.

drift. Even when you fly first class with fully reclined seats and a silk blindfold, jet travel through time zones is still monumentally stressful to your hormonal and immune function,

Even if you faithfully wrap up your emails or Netflix queue and turn out the lights by 10 p.m. every night, you are still blasting several hundred hours’ worth of highly stressful artificial light and digital stimulation after dark into your central nervous system over the course of a calendar year.

Water with a bit of sea salt is fine—no need for sugary sports drinks.

Move more and track your progress by measuring improvements in your level of morning stiffness.

This cortisol showerhead analogy summarizes everything Mark and Brad have bantered about for the past twenty-seven years related to balancing training with recovery, balancing health while you pursue ambitious fitness goals, and, perhaps most profoundly, balancing peak performance ambitions with longevity.

Beyond Training - Ben Greenfield