Marathon Hydration, Solved: Exact Fluids, Carbs, and Sodium You Need on a Race Day
Marathon hydration isn’t one-size-fits-all: Samuel Cheuvront’s approach is to start normally hydrated, drink to your sweat rate, keep carbs at 30–60 g/hour, and use sodium only when heat, duration, or salty sweat demands it.
.webp)


.jpg)
.webp)
.png)
.jpg)


