A growing number of people attempting to get in shape fast are intrigued by high-intensity interval training, or HIIT. Simply put, HIIT is a cardiorespiratory training technique alternating short bouts of intense anaerobic exercise and brief recovery intervals to maximize the efficiency of a workout. The trick is to push yourself hard enough in a short period of time that you cannot exercise more. A typical HIIT workout lasts from 20 to 30 minutes
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Vitality With Kelly: HIIT – Getting the most out of your workout …