‘HEAT’ High-intensity interval training (HIIT) is an enhanced form of interval training, an exercise strategy alternating 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. You’ll use a variety of body weight and plyometric exercises, run, skip, bike and row with all the best equipment around.