Shoulders that are rounded forward or slightly raised produce tension within the neck which will create headaches worse. the subsequent exercises will facilitate correct these habits and de-stress the muscles.
Shoulder Shrugs
Sitting or standing tall with arms relaxed and hanging down at your sides, raise your shoulders till they bit your ears (or nearly so). Then pull your shoulder blades along and rotate your shoulders toward the rear and down. Repeat a minimum of five times.
Shoulder Pull-Back
Stand or sit erect, fold your hands along, and place your folded hands underneath your chin, knuckle-side up. Keeping your chin parallel to the ground, squeeze your shoulder blades along, hold for a count of five, then unleash. Repeat a minimum of five times.