Stand with your feet hip width apart and back straight. Grasp two dumbbells of equal weight in each hand, holding the weights directly in the middle. Keep your wrists straight. Lift the weights above your head with palms facing forward until the weights touch. Slowly lower the dumbbells, bending at the elbows, until your arms form two 90-degree angles at your sides. Bring your arms back up overhead and together so that dumbbells are touching again. Make sure you do not arch your back during the movement.