High-intensity interval training (HIIT), also known as high-intensity intermittent exercise (HIIE) or sprint interval training (SIT), is a form of interval training: an exercise strategy that alternates periods of short intense anaerobic exercise with less-intense recovery periods.
HIIT is a form of cardiovascular exercise; these short, intense workouts provide improved athletic capacity and condition, improved glucose metabolism, and improved fat burning.
For more information about Hiit and how it works, check out the American College of Sports Medicine and the ACE link.
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