fartlek training

fart·lek train·ing

(fahrt'lek trān'ing)
Relatively unstructured interval-type training for aerobic fitness; consists of alternating intervals of fast- and slow-paced training over natural terrain (usually hilly countryside).
Synonym(s): speed play.
[Swed. fart, speed, + lek, play]

Fartlek training

a form of physical training used in humans and applicable to Greyhounds and horses. Involves exercising over long distances continuously but with variation in the speed of movement.
References in periodicals archive ?
With fartlek training, you can experiment with pace and endurance.
I find fartlek training a great alternative to a steady run.
Six miles fartlek training (see above for more details), working hard
70 minutes' easy cycling Four miles fartlek training.
The days of not seeing the ball for two weeks have gone but the emphasis is still very much on fitness with fartlek training - that's the old walk-jog-run routine - and a proper run for two-and-a-bit miles.
The remaining two sessions should include both hills and fartlek training.
Fartlek training is a way of increasing your endurance and speed.
Fartlek training involves varying your pace throughout your run, alternating between jogging, walking and sprinting and is a great alternative to a steady run.
Interactive elements (which are all clearly signposted, for any little ones who may be under the impression they are going to a pint-sized improv session) included the wondrous bicycle of energy, a flipper-influenced illustration of how diet effects athletic productivity and a demonstration of the Fartlek training principle using the medium of contemporary rhythmic gymnastics.
This includes long slowdistance training, pace or tempo training, interval training, circuit training and fartlek training.