You don't have to be a fitness industry veteran to realize that high-intensity interval workouts are in high demand. High-intensity interval training (HIIT), which alternates short bursts of intense exercise with periods of rest, claimed the top spot on the American College of Sports Medicine's annual list of fitness trends, and high-intensity workouts Insanity and CrossFit were the two most-Googled workouts of 2013. Although the philosophy behind HIIT has been around for ...

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