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Relentless Forward Progress: The Building Blocks of Ultramarathon Training

Intentionally depete your body's glycogen stores for a long run

Day one, run a moderate-intensity 25 - 30 miles without consuming any calories. Day two: run an easy 20 - 25 miles without consuming any calories. Refrain from eating carbohydrates from the start of the workont on day one until after day two.