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Fartlek, (Swedish: “Speed Play”), approach to distance-running training involving variations of pace from walking to sprinting aimed at eliminating boredom and enhancing the psychological aspects of conditioning.
In simple terms, starting as a jog , slowly increasing your speed and ending it as speed run.
This treadmill workout is a fartlek workout that will not only help improve your speed, but also help prevent boredom on the treadmill.
Fartlek by YourUrbanPerson March 4, 2022
From the German translation 'Speed Play', fartlek is a training exercise used by distance runners to increase their anaroebic capacity. This increases racing performance greatly by allowing muscles to better cope with the lack of oxygen associated with high-intensity activities. The process involves speeding up to race pace for several minutes, then jogging for several minutes, repeating until workout is over.
Uli did 2 hours of fartleks yesterday to get ready for the Seattle Marathon, he's insane!
fartlek by Leif June 10, 2006

Fargleknocker 

did you see her all over that guy last night? yeah, she's such a fargleknocker!
Fargleknocker by WAHScheer March 1, 2011

Fartneken 

The frankly disturbing act of inserting one end of a length of hosepipe up your anus, placing the other end into a drink, then expelling your fart through said pipe. The result is the formation of a methane infused beverage as the gas bubbles through the drink. The drink should then be enthusiastically guzzled by yourself / lover / friend / victim.

See also Stealth - Fartneken where you do this to an unbeknown recipient who will wonder why you are laughing as they down their 'fruity elixir'.

The discipline has also given rise to several sub genres according to odour, volume, bubble volume etc.
'A great meal rounded off superbly when Fatty had to see off 3 Fartnekens after losing at spoof. Turnip with a hint of peanut too. Result.'
Fartneken by TBoor74 November 7, 2014

Charley warley fartley

my little charley warley that likes to fartley
"I need to take a little charley warley fartley"
Charley warley fartley by Chacoal October 20, 2022
An activity runners do when they change between sprinting and jogging
"Guy 1: Dude why did you slow down?"

"Guy 2: Just gotta do a Fartlek"
Fartlek by Chris3103 April 23, 2023