24 Best HIIT Workouts to Burn Fat and Build Muscle - What Is HIIT

HIIT, or high-intensity interval training, can be an efficient, fun way to tackle your cardio workouts, add muscle, and shred serious fat.

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24 Best HIIT Workouts to Burn Fat and Build Muscle - What Is HIIT

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Warmup Exercise 3: Jumping Jack, For a Major Muscle-Building Challenge, Try This 45-Minute Dumbbell HIIT Workout, jumping jacks

The Best HIIT Workout for Muscle Building

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The Best High Intensity Interval Training (HIIT) Workout Routine

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A 15-minute full body HIIT workout — no equipment required