Hi, my name is Gene Sanders, Im a professional certified trainer. Right now Im going to take you through a Posterior Deltoid Routine, which is basically the back of your shoulders. These muscles right here are important for strengthening, to help out with your overall posture. What you would want to do is you want to go ahead and get some light dumbbells and start out just like you would in a Military Press, with your elbows at 90, and from this position while maintaining good posture, sitting on top of the Swiss ball, you are going to drop the dumbbells straight down, until youre completely level with your shoulder, and then come right back up again. So, you dont want to rotate all the way through, instead youre just coming down to here and back up again, 12-15 repetitions.