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Fartlek (speed play) is a less formal version of interval training that is especially suited to training away from the track. It mixes bursts of faster paced intervals of work with slower running within the context of a longer run on trails. The length and the intensity of the faster runs are decided by the runner, depending upon what he or she needs and feels at the time. Fartlek is a valuable training method because it allows a wide range of intensities, while also helping prevent the stress injuries that can come from training on pavement or running tracks.
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