>So training in a glycogen depleted state (back then we called this bonking) is bad news if you want to increase your aerobic threshold These is a difference b

>So training in a glycogen depleted state (back then we called this bonking) is bad news if you want to increase your aerobic threshold These is a difference between burning glucose as the primary fuel source, depleting it, and bonking vs using fat as the primary fuel source to begin with (there is no bonking). But basically glucose store empty pretty quickly and if not refueled the body shuts down to conserve the limited glucose for the brain because that is it’s primary fuel source (the body shut down is the bonking). When in keotsis, the burning of fat produces a by product, ketones, which is a different source of fuel for the brain. So when in ketosis when burning fat as the primary fuel source (which is essentially limitless compared to glucose) there is no bonk because 1. You don’t run out of fat (like you would glucose), and 2. As you burn fat you produce ketones to fuel the brain (which isn’t happening when burning glucose as the primary fuel). For example my last marathon I ran in ketosis I did with only water and electrolytes (no fuel), I cant do that if I’m not in ketosis. Your point about being able to more efficiently increase the aerobic threshold while using glucose sounds right.