Popsugar Health & Fitness Hiit Workouts 45-Minute HIIT Workout I Do CrossFit and This 45-Minute Workout Kicked My Butt (and My Legs and Arms)! 3 February 2019 by Jenny Sugar View On One Page Photo 3 of 3 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 HIIT Workouts45-minute WorkoutsIntermediate WorkoutsCardio WorkoutsStrength TrainingWorkouts