Another mental note to self ... LSD stuff!

How to run LSD to train to run faster

Glycogen is the storage form of carbohydrate, and when you run low, you run slow. An important objective of long runs is to deplete your glycogen stores which stimulates your muscles and liver to store more glycogen-to help prevent future depletion. Because the faster you run the more glycogen you burn, running your long runs at a solid pace is a more effective way to deplete your glycogen stores (and hence stimulate the muscles to store more) than running slowly. Similarly, long runs train your muscles to rely more on fat and less on carbohydrates at a given speed so your glycogen stores last longer. If you jog your long runs your body will adapt to burn fat at a very slow pace but will not necessarily be trained to increase the proportion of fat utilised at speeds approaching race pace.