Popsugar Fitness Workouts Dumbbell Arm Workout For Women Build Lean Muscle With This 20-Minute, 5-Move Dumbbell Arm Workout January 28, 2021 by Jenny Sugar View On One Page Photo 5 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Rotational Floor Press Lie on your back on the floor with your knees bent and your lower back pressing into the mat. Hold a dumbbell in each hand above your chest, with your elbows bent out wide and your palms facing away from your face. Press both dumbbells above you, and rotate your arms at the midpoint of the exercise so that your palms are now facing each other. Return to the starting position by rotating your hands again at the midpoint of the exercise. This counts as one rep. Perform 12 reps. Previous Next Start Slideshow WorkoutsStrength TrainingBeginner WorkoutsArm Workouts20-Minute WorkoutsArm Exercises