Popsugar Health & Fitness 20-Minute Workouts 20-Minute HIIT Cardio Workout When I Can't Go For a Run, This is the 20-Minute Cardio HIIT Workout I Do at Home 12 October 2019 by Jenny Sugar View On One Page Photo 4 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Box Jumps Stand with your feet slightly wider than hips-width distance apart in front of a sturdy box that's six to 24 (or more!) inches tall. Bend your knees and swing your arms back. Jump onto the top of the box with both feet, swinging your arms forward to give you a little momentum. Step one foot at a time back to the floor, or jump down softly with both feet. This counts as one rep. Do as many box jumps as you can for 40 seconds, followed by a 20-second rest. Previous Next Start Slideshow 20-Minute WorkoutsIntermediate WorkoutsCardio WorkoutsWorkouts