How Much Sodium Do You Lose in Sweat? The Science Behind Your Salt Loss
Sodium is the electrolyte you lose most when you sweat — and the difference between individuals is enormous. Here's what the science says and why it matters for your training.
What Is a Sweat Test — and Do You Actually Need One?
A sweat test measures the sodium composition of your sweat so you can build a personalized hydration strategy — instead of guessing. Here's what it involves and whether you need one.