Starting Position: Stand holding dumbbells in front of you thighs using a closed, pronated grip (thumbs around the handles and palms facing your thighs). Position the dumbbells lightly touching the fronts of your thighs with your elbows extended or holding a slight bend. Assume either a split-stance position to stabilize your body or position your feet slightly wider than hip-width apart.
Stiffen your torso by contracting your abdominal/core muscles ("bracing"), and depress and retract your scapulae (pull your shoulders down and back), maintaining this position throughout the exercise. Your head position should be aligned with your spine.
Upward Phase: Exhale and slowly raise the dumbbells up in front of your body. Your elbows and upper arms should rise together and be slightly ahead of your forearms and dumbbells. As your arms move past 60 - 70 degrees (nearing shoulder level), slowly rotate them upwards somewhat so that the inside edge of the dumbbells point slightly upwards. Continue raising the dumbbells until your arms are level with your shoulders and approximately parallel with the floor. Maintain an erect torso (no arching of your low back) and neutral wrist position (avoid flexion and extension of your wrists).
Downward Phase: Inhale and gently lower the dumbbells back towards your starting position keeping your elbows slightly extended. Maintain your foot, torso, shoulder and wrist positions while lowering the dumbbells and rotating them slightly inwards as your arms pass that 60-70 degree mark.