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Pacing is the most important aspect of marathon racing. Your success in a long race depends on conserving your energy during the crucial first hour. That’s when your body is running on the greatest proportion of its limited stores of muscle glycogen.

You will hit the wall once you run out of muscle glycogen. If you don’t want to suffer the ignominy of a crashing slow down in the last hour of the race, you must wait for fat metabolism to turn on during the first hour. Once you are running efficiently on a combination of fat and glycogen, you can run for a long time at your desired race pace.

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