High-Intensity Interval Training (HIIT)

High-Intensity Interval Training (HIIT) is a cardiovascular exercise strategy that alternates short periods of intense, near-maximal anaerobic exercise with less intense recovery periods or complete rest. Rather than a specific exercise itself, HIIT is a training modality that can be applied to various activities such as running, cycling, rowing, or bodyweight movements (e.g., burpees and squats). It is specifically defined by reaching 80% to 100% of an individual's maximal heart rate (HRmax) during the 'work' intervals, followed by lower-intensity 'relief' intervals.