What does it take
to
stay exceptional
for decades?

Entropy measures how hard your body is working to shed heat, read from your temple.

At rest, it shows the load your body is carrying across many systems: thermal, immune, digestive, cognitive, emotional, pharmacological, postural, reproductive, and recovery. Healthier bodies maintain low Entropy at rest, and we call that your
Resting Entropy

During activity, heat dissipation becomes mostly aerobic. The highest Entropy you sustain near your max heart rate, is your Entropy Max.

Your Resting Entropy and your Entropy Max combine into Span: the one number that shows you how well your body is doing across a wide range of systems.