This Is the Best HIIT Workout, According to Science

Any HIIT (high-intensity interval training) session has major fat-burning benefits, but a 4x4 workout is tops for improving fitness.

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Benefits of HIIT Training and Workouts

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Is high-intensity interval training (HIIT) the most efficient way

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Beginner HIIT Workouts: Use HIIT to Burn Fat and Build Muscle