The YTWL is an extremely effective circuit for the posterior shoulder complex and posture. It helps strengthen the commonly weak and dysfunctional muscles the rhomboids, lower traps, mid traps, and external rotators. This is an important circuit for those who sit hunched over at desks or computers all day. Most people are tight in the front and weak in the back. We will do 3 sets in this workout. The first set is standing, the second set is on a bench, and the thrid set is on a stability ball. I highly recommend adding this workout into your regular routine 1, 2, or 3 times a week for healthy, stable shoulders.