The phrase “run slow to race fast” refers to a training philosophy for long distance running and endurance training. The idea is that by running at a slower pace during training, your body can improve its aerobic energy system. The time spent running at a slow pace helps your body increase the rate at which it converts oxygen to glycogen for fuel. At the cellular level, slow aerobic running develops aerobic enzymes and mitochondrial density which helps increase aerobic energy production.

This approach can be effective for runners targeting a race distance of over 5 km 3. It also builds resistance to fatigue so you become durable to the long grind that is marathon training.
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