Ryan Ignatz is an expert on electrolyte replacement and hydration, and can perform a Sweat Test to determine the exact amount of Sodium YOU lose when exercising. Everyone is very different so this is important! He tested me - what was the result??
"You lose 1,453mg of Sodium per liter of sweat. You are a very salty sweater."
I rarely supplement my fluid intake with electrolytes. Does that mean I've been doing it wrong for 50 years? Probably yes! Aack!
The current wisdom is "Drink to thirst". Is that good advice?