Fartlek is the Swedish for “speed play,” and that is exactly what this type of run is all about. Unlike tempo and interval work, fartlek is unstructured and alternates between moderate to hard efforts with easy efforts
throughout.
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“Run hard up the hill to the crest, jog to cross walk, accelerate the short downhill, jog to the intersection, run quickly around the block” versus “run 6-5-4-3-2 minutes faster with 2 minutes jogging recovery,” is an example of a structured fartlek. Fartlek workouts are versatile.