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Ready to take on a half-marathon? If you can run at least four miles at a steady pace without walking or are looking for a bigger-than-10K challenge, follow this program designed exclusively for FITNESS by running coach Andrew Kastor, who creates online training programs for the New York Road Runners club. It mixes intervals into your mileage to put speed and spring in your stride.
BONUS: Sign up for our 8-week half-marathon training course to get workouts, nutrition info, and motivation tips sent straight to your inbox.