"Training to avoid hyponatremia:

* Drink small amounts of fluids to stay hydrated, but don't overdose on water.
* Take in electrolytes through sports drinks which have sodium and potassium.
* Ask the race director what fluids will be given on race day.
* Try to eat snack foods with salt, like pretzels or chips."

This is so simple. You sweat a bunch, you take a little break, drink something, maybe have a pretzel. Big whoop.