Popsugar Health & Fitness Trainer Tips 45-Minute HIIT Workout For Small Spaces Grab Your Dumbbells and a Towel, Because This 45-Minute HIIT Workout Heats Up Fast 27 February 2020 by Emilia Benton View On One Page Photo 8 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 3-Minute HIIT Finisher Run in place, driving your knees up with maximal intensity for 20 seconds. Immediately drop into a squat and hold for 10 seconds. Repeat for a total of six rounds. Previous Next Start Slideshow Trainer TipsHIIT Workouts45-minute WorkoutsIntermediate WorkoutsHIITWorkouts