# fartlek

> English word · Noun · IPA /ˈfɑːtlɛk/

## Definitions
1. An athletic training technique, used especially in running, in which periods of intense effort alternate with periods of less strenuous effort in a continuous workout.

## Etymology
Borrowed from Swedish fartlek, from fart (“speed”) + lek (“child’s play”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fartlek