HIIT
abbreviation or noun
: a form of interval training that alternates very brief periods (such as 20 to 40 seconds) of intense exercise at maximum effort with periods (such as 15 to 30 seconds) of less intense exercise : high-intensity interval training
HIIT, or high-intensity interval training, is a training technique that requires you to perform quick, intense bursts of exercise, followed by short and active recovery periods.—Sudhakar Jha
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Merriam-Webster unabridged
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