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Some will argue that you should do your long runs in marathon training on an empty stomach, to practice depleting your body of glycogen, not just to prepare for the experience of doing the same in the longest run itself but to also prime your glycogen stores to hyper-compensate and hopefully store more glycogen than before.
Some will argue that you should eat a good meal before long runs and stay completely fueled, in order to maximize your performance on these runs, avoid bonking, and maximize the potential physiological hypertrophy (growth) from these long runs.
Some will argue that you should practice doing it both ways, that both approaches have their respective benefits and that doing both will maximize your development prior to the taper and the longest run itself.
What is my point of view? I’ll be honest: My point of view has gone back and forth. I have trained with long runs on nothing more than a small meal beforehand, to push myself to the limit otherwise cold turkey. I have eaten a full breakfast, then brought 2 liters of Gatorade in a hydration pack and fueled religiously throughout the run, even stopping to eat or drink during the workout as needed.
But now, when it comes to the best way to do marathon training long runs, I come back to a semi-rhetorical question:
What is the primary goal of a marathon training long run?



