Definition of fartlek in English:

fartlek

Line breaks: fart|lek
Pronunciation: /ˈfɑːtlɛk
 
/

noun

[mass noun] Athletics
A system of training for distance runners in which the terrain and pace are continually varied.
More example sentences
  • Also called fartlek training, intervals are used by competitive endurance athletes for improving speed and conditioning.
  • The basics of fartlek is to vary your training routine, have fun and invent new things to do.
  • This weekly program devotes four days to recovery training and two to aerobic and threshold training, via fartlek or ‘speed play’ exercise.

Origin

1940s: from Swedish, from fart 'speed' + lek 'play'.

Definition of fartlek in:

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Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected