Start standing with your feet hip-width apart, knees slightly bent, holding a dumbbell in each hand with your palms facing each other. Keeping your back flat and core engaged, bend forward at the hips so your arms hang below your shoulders.
Exhale and raise both arms out to the side, maintaining a slight bend in the elbows and squeezing your shoulder blades together.
Then, with control, lower the dumbbells back toward the floor. That's one rep.