My guests today are veterans of Science of Ultra; they joined me in Episode 4. LISTEN TO THAT EPISODE (#4) FIRST IF YOU HAVEN’T ALREADY. Today we continue our series with them on all things sweating, hydration, electrolytes, and fluid balance. 

This is the episode you'll come back to over and over. It is the must know ultimate crash course in hydration and electrolyte physiology. Get ready to take notes!