Popsugar Health & Fitness Workouts 15-Minute Arm Workout Grab Your Dumbbells and Build Muscle With This 15-Minute Arm Workout 13 July 2018 by Tamara Pridgett View On One Page Photo 6 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Skull Crusher Lie face up on a flat bench or mat with your dumbbells in hand. Begin with your arms straight up in the air, keeping a slight bend in your elbows. Only bending at the elbows, lower the weights down toward the sides of your head. The weights will end up close to your ears. Press the weights back up to starting position. Complete 12 reps. Previous Next Start Slideshow Trainer TipsBody Weight15-Minute WorkoutsFitness TipsBodyweight ExercisesArm WorkoutsBeginner WorkoutsArm ExercisesStrength TrainingWorkouts