Popsugar Health & Fitness Workouts What Are the Best Dumbbell Arm Exercises? Grab a Pair of Dumbbells — These Are the Best Moves For Strong, Defined Arm Muscles 24 January 2019 by Jenny Sugar View On One Page Photo 9 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Overhead Triceps Extensions Stand with your feet hip-distance apart. Hold one dumbbell (go for your heavier weight) with both hands, bending your elbows behind your head. Straighten your arms to lift the dumbbell into the air, then slowly bend your arms to lower. This counts as one rep. Previous Next Start Slideshow Workouts