Popsugar Fitness Workouts 45-Minute HIIT Workout This 45-Minute HIIT Workout Is Intense, but It Will Build Your Endurance February 12, 2019 by Jenny Sugar View On One Page Photo 4 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Previous Next Start Slideshow WorkoutsStrength TrainingCardio WorkoutsHIIT WorkoutsIntermediate Workouts45-minute Workouts