Acronym for High-Intensity Interval Training, a cardiovascular session which involves a warmup period, several short, maximum-intensity efforts separated by moderate recovery intervals, and a cooldown period. The period of alternating effort and recovery intervals typically lasts a total of 15-20 minutes.
"Dude, what's your secret to all that weight loss?"
"A good diet, HIIT 3-4x per week, and a hot chick I wanna fuck for motivation"
by SammyAbaby July 01, 2008

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