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Heres something youll love to learn: Your shoulders and upper back tend to carry less fat than the rest of your body, so the right arm exercises can give this area a nearly instant makeover, says Ramona Braganza, a celebrity trainer who has worked with stars such as Anne Hathaway and Jessica Alba. Braganzas upperbody workout, below, hits every major muscle and will help stabilize your shoulder joints, improve your posture, and build that strong, toned look youre after.For this arm workout, use fiveto eightpound weights, perform 15 to 20 reps of each exercise and go from one move to the next with little or no rest between. Do two or three sets three times a week.