English

Definition of fartlek noun from the Oxford Advanced Learner's Dictionary

 

fartlek

 noun
noun
BrE BrE//ˈfɑːtlek//
 
; NAmE NAmE//ˈfɑːrtlek//
 
[uncountable]
 
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training for runners in which the speed and type of ground are varied Word Origin 1940s: from Swedish, from fart ‘speed’ + lek ‘play’.
See the Oxford Advanced American Dictionary entry: fartlek