In this engaging discussion, Dr. James Morton, an expert in exercise metabolism and nutrition, shares insights from his work with elite athletes. He emphasizes carbohydrate periodization and its impact on performance, highlighting the principle of fueling for the work required. Key topics include training with low glycogen levels, the critical role of nutrition in recovery, and how age and sex affect dietary needs for athletes. The conversation is a treasure trove of strategies for optimizing endurance, particularly for ultra marathon runners.