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It is no surprise the whole fitness world has been taken over by HIIT - or variations of HIIT for many years now. These high-intensity interval-training sessions ask for 100% effort of quick bursts of exercise, a format that promises to torch away calories within a short period of time. Examples of HIIT classes can be a military-style bootcamp class, workouts with Tabata, or a session that involves functional style training or even Crossfit.