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.
A workout using this technique.
Origin:
Origin: Swedish, speed play
Origin: : fart, running, speed (from fara, to go, move, from Old Norse; see per-2 in Indo-European roots)
Origin: + lek, play (from leka, to play, from Old Norse leika)