How can I properly perform a dumbbell Cuban rotation exercise to strengthen my shoulders and improve my overall upper body mobility?

To properly perform a dumbbell Cuban rotation exercise, start by holding a dumbbell in each hand at shoulder height with palms facing down. Keeping your elbows bent, rotate your arms outward and upward until they are parallel to the ground. Slowly lower back to the starting position. This exercise strengthens shoulder muscles and improves upper body mobility.