This 15-minute HIIT workout is a great way to break a full-body sweat when you’re short on time. No equipment is needed – just your bodyweight! You can do this on travel, in your room, or anywhere you’re caught without a gym. Even though HIIT workouts are short, they are intense. You shouldn’t be able to go longer than 15 minutes. I don’t recommend doing HIIT more than once or twice a week for most people, if that.

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