The word for today is…
fartlek (noun):
: endurance training in which a runner alternates periods of sprinting with periods of jogging
Source : Merriam -Webster
Etymology : Swedish, from fart speed, pace (from Middle Low German vart journey, pace, alteration of Old Saxon fard; akin to Old English fierd, fyrd military expedition, campaign) + lek play, game, from Old Norse leikr
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