PopsugarFitnessWorkouts20-Minute Outdoor HIIT Running WorkoutThis 20-Minute Outdoor HIIT Running Workout Is the Ultimate Test of Your Speed and Endurance November 1, 2020 by Maggie Ryan View On One Page Photo 6 of 6 ADVERTISEMENT () Start Slideshow Share This LinkCopy ← Use Arrow Keys → 6PreviousNext Start Slideshow WorkoutsRunningCardio WorkoutsHIIT WorkoutsNo-Equipment Cardio WorkoutsIntermediate Workouts20-Minute Workouts