Calling out swimmers and baseball players

I'm not sure if it was the conference I recently attended or the string of baseball players I've been seeing in the clinic, but I have re-discovered a favorite.  A favorite exercise of mine is the "YTWL" series.  I have traditionally done this prone on a stability ball, but must admit; this tends to limit one's range of motion just a bit at the shoulder joint.  Two variations of this exercise are below.  The ultimate core challenge is to do this series in a standing posture with forward flexion of the trunk (close to parallel with the floor) with a stable core.  Both swimmers and baseball players with their high volume of overhead activity suffer from peri-scapular muscle dysfunction or weakness.  When these muscles don't set the base (shoulder blade) for optimum arm function it leads to rotator cuff pathology or other compensations leading to laxity/ weakness/ pain.  The series of exercises shown below are excellent for conditioning the overhead athlete or weekend warrior/ triathlete.