Popsugar Health & Fitness Body Weight Quick HIIT Workout You Won't Believe How Sore This 16-Minute Bodyweight HIIT Workout Will Make You 28 December 2018 by Jenny Sugar View On One Page Photo 1 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 High Knees Run in place while lifting your knees high to the level of your waist. Engage your abs as the knee comes up. Pump your arms to warm up your upper body. Keep going for 45 seconds, then rest for 15. Previous Next Start Slideshow Body WeightHIIT WorkoutsFull-Body ExercisesBodyweight ExercisesFull-Body WorkoutsWorkouts