This simple exercise is a great way to slim down your shoulders and back. It works by strengthening the muscles in these areas, which can help to improve posture and reduce the appearance of excess weight.

To do the exercise, follow these steps:

1. Stand upright with your feet shoulder-width apart and your knees slightly bent.
2. Hold a two-pound ball or other object of equal weight in each hand at your hips.
3. Raise your arms straight up above your head, keeping your back straight.
4. Pass the ball from one hand to the other, making a windmill motion.
5. Repeat the movement 20 times.