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fartlek (n.)

1952, Swedish, from fart "speed" (cognate with Old Norse fara "to go, move;" see fare (v.)) + lek "play" (cognate with Old Norse leika "play;" see lark (v.)).

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Definitions of fartlek

fartlek (n.)
a method of athletic training (especially for runners) in which strenuous effort and normal effort alternate in a continuous exercise;
From wordnet.princeton.edu