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Your Hard Workout Won't Make You Fitter Tomorrow. Here's How Long It Actually Takes to Get Faster.
Runner's World spoke with RRCA-certified run coach Laura Norris and other experts about the adaptation timeline after hard workouts: the body generally needs seven to 10 days to adapt to a single hard session, up to 14 days, but most runners won't see changes in pace and performance until about eight to 12 weeks into training.
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