High-Intensity Interval Training - a workout method alternating short bursts of intense exercise with periods of rest or low-intensity recovery. It efficiently improves cardiovascular fitness and burns calories.
Acronym formed from 'High-Intensity Interval Training,' popularized in fitness culture in the early 2000s. The concept dates to the 1930s with fartlek training, but HIIT as a branded methodology emerged with modern fitness marketing.
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