Every year, more than a million people around the world run a marathon. For some, it will be one of many, but for others, it will be a highlight of their lives. If you’re drawn to the challenge and excitement of running a “26.2” this year (or sometime in the future), you’ve got work to do. Most marathoners train for about 16 weeks to prepare, which means starting now for a fall race. That means focusing on lower-effort miles where you can accomplish the “three Cs,” Mr. Fitzgerald said.

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