American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
On her recommendation, for any fartlek or threshold training session I make sure I do a gentle warm-up and warm-down jog, which I probably wouldn't otherwise have bothered with.— The Guardian World News
You don't find the word "fartlek" in the least bit amusing.— Spence Smith - Connecting People To The World Of Travel, Fitness, Culture and Blogging
If you want to improve your 1.5 miles you must do 20-30 min runs using fartlek.— Army Rumour Service
One of the most popular types of cardio training is interval training also known as fartlek running.— ReadABlog.com New Blogs and RSS Feeds
- The funniest word in the English language is fartlek (an athletic training regime); other funny words include furphy, pratfall, parp and firkin.— Releases feed from RealWire

American Heritage Dictionary (1)
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