I know. You read the title and chuckled. Everyone does. It’s the Swedish word fartlek. Not fart lick, even though they sound the same. Fartlek means “speed play.” In the running world, any time you mix hard/fast running with a rest period it is considered a fartlek. What makes it different from speed training is that a fartlek is not as structured. I mean, doing speed training on the track might be something like 4 sets of 1 mile with 400m recovery.
A fartlek would be more like running a 7 mile loop, then running for 1 minute at a pace faster than race pace. Next, run for a 1 minute recovery. Or, you could run really hard from one power/telephone pole to the next, then recover. You do that for 5 miles, then run a cool down mile and call the day “good.”
I have found fartleks good in developing both speed and endurance while being a somewhat pleasant experience. Meaning one isn’t just running circles around a track for miles. Fartleks can be a fun way groups can speed train together. For example you have 10 runners running in line and at every minute the runner in the back sprints up to the front and takes the lead. This type of fartlek would be repeated for miles and miles.Not only a great way to build speed and endurance, but a great way to make and develop friendships. My running friends all love me for the crazy ways I come up to train.