root - our experiences are a bit different, in that BFS Jr. struggled in a few areas...I worked with him, and had others work with him to fix them...one area was at foot plant, his plant foot knee would favor (somewhat give) towards 3B (he is a LHP - good size), he also had a problem with his arm action, and at the high cock phase was typically outside of 90 degrees. Just telling him to firm up the front side so his knee would stable, or just verbally telling him to correct his arm action was not effective. We wound up doing drills that made him feel what it was like to activate, and rotate his back hip around his front leg...when he finally was able to consistently do this, his front side firmed up where he was very stable right through ball release, AND since his back hip rotating, a side effect was that it helped his arm get into internal rotation much more free and easy, and much shorter...without it being taught his arm action improved greatly. From a velocity standpoint he added velocity, and appears when watching it live, and in video to be with much less effort.
