Blood Sodium vs Body Sodium — Why the Test Your Doctor Orders Won't Help You Race

Reece Noble

Published on: 11/03/2026

Your blood sodium is tightly regulated regardless of how hard you train. Here's why that makes it useless for race planning.

Hydration Science

The Science Behind Your Sweat — What Your Body Is Actually Doing

Reece Noble

Published on: 11/11/2025

Sweat isn't just water. Understanding what's in it — and why it varies so much between people — is the foundation of smart hydration.

Hydration Science