A training method that blends continuous running with interval training through unstructured speed variations. Athletes vary their pace spontaneously during a run, alternating between fast bursts and recovery periods based on feel rather than predetermined distances or times.
Swedish compound word meaning 'speed play,' coined by coach Gösta Holmér in the 1930s. 'Fart' means speed in Swedish, and 'lek' means play, emphasizing the playful, unstructured nature of this training approach.
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