Popsugar Health & Fitness Injury Prevention Exercises With 1 Dumbbell All You Need Is 1 Dumbbell For These 20 Intense, Muscle-Building Moves 25 June 2018 by Jenny Sugar View On One Page Photo 2 of 20 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Overhead Triceps Extensions Stand with your feet hip-distance apart. Hold one dumbbell (go for your heavier weight) with both hands, bending the elbows behind your head. Straighten your arms to lift the dumbbell into the air, then slowly bend the arms to lower. This counts as one rep. Previous Next Start Slideshow Injury PreventionArm ExercisesButt ExercisesStrength TrainingWorkoutsAb Exercises