Popsugar Fitness Workouts 20-Minute Cardio HIIT Workout Boost Your Metabolism With This At-Home HIIT Workout December 29, 2017 by Susi May View On One Page Photo 2 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Under the Fence and Kick Start with your feet together. Step out to the side with your right foot, and bend forward at the hips slightly, keeping your back flat. With a neutral spine, bring your body to the right side in a sweeping motion, like you're ducking under a fence. Step your left foot to meet your right, and kick your right foot up to the side, keeping your hands close to your core. Repeat on the other side. Continue for 40 seconds, then rest for 20 seconds. Previous Next Start Slideshow WorkoutsStrength TrainingAdvanced WorkoutsBodyweight WorkoutsGIFHIIT WorkoutsIntermediate WorkoutsFull-Body Workouts20-Minute Workouts