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 3 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Overhead Shoulder Press Hold a dumbbell in each hand just above the shoulders, palms facing in. Straighten the arms above you. Bend the elbows coming back to the starting position to complete one rep. Do as many reps as you can in 40 seconds, then rest for 1:20 before starting back on your cardio machine. Previous Next Start Slideshow WorkoutsStrength TrainingCardio WorkoutsHIIT WorkoutsIntermediate Workouts45-minute Workouts