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Your Ultimate, Science-Backed Guide to High-Intensity Interval Training
If you want to run fast, the saying goes, you've got to run fast. To stoke speed, most runners do traditional speedwork: aiming for near race pace over distances of 400 meters or more, with recovery periods equal to the length of the repeat (or slightly less). Or you can get fast even faster with supershort, superfast efforts, sometimes referred to as high intensity interval training (HIIT).