It's generally accepted that humans can live for three days without water but they can go weeks without food. Not something that any of us ever want to test, but a good corollary to how we fuel our endurance events. The importance of hydration cannot be overstated. Most endurance athletes approach race day as a calorie problem, not a fluid problem. This approach is short-sighted given the importance of hydration, as it enables athletes to maintain desired levels of high athletic function.   Here’s a hydration primer:   The Basics [here] Source the right stuff (Carbs + Electrolytes) Conduct a Sweat Test Outline a Progression Warning Signs: Swollen finders, Dizziness, Lack of Sweat, Sloshy Stomach Watch the video on YouTube here: https://youtu.be/g50vXgJVn0M