Why You're Cramping at Kilometre 30 (And It's Not What You Think)
Reece NoblePublished on: 07/07/2026
Cramping has been blamed on dehydration for decades. The science tells a more complicated — and more useful — story.
Race Day
Reece Noble
Why Two Athletes at the Same Race Have Completely Different Hydration Needs
Reece NoblePublished on: 06/05/2026
Same distance, same conditions, same finish line — and wildly different sodium requirements. Here's why.
Sweat Testing
The One Test That Doesn't Change — Why Your Sweat Data Is Useful Forever
Reece NoblePublished on: 06/04/2026
Unlike VO2 max or lactate threshold, your sweat sodium concentration is fixed. Test once, and the data never expires.
Sweat Testing
Blood Sodium vs Body Sodium — Why the Test Your Doctor Orders Won't Help You Race
Reece NoblePublished 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