traveyard: Find the six best HIIT workouts under 20 minutes that will tone and tighten, boost metabolism and get your heart rate up in less than 20 minutes. Whether you're working out at home or a gym, these workouts will continue to burn calories throughout the day.

Find the six best HIIT workouts under 20 minutes that will tone and tighten, boost metabolism and get your heart rate up in less than 20 minutes. Whether you're working out at home or a gym, these workouts will continue to burn calories throughout the day.

Find the six best HIIT workouts under 20 minutes that will tone and tighten, boost metabolism and get your heart rate up in less than 20 minutes. Whether you're working out at home or a gym, these workouts will continue to burn calories throughout the day.

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