I had mentioned this topic in a prior thread and was urged to put up a thread on it so here goes a very brief explanation.
There are four major points of resistance a pitchers body needs to achieve in order to transfer energy. Missing any of these four will result in a less than optimal performance. When you look at these pics and listen to the discussion it may sound "mechanical", but in an elite level pitcher these resistance points appear to be very smooth and seamless.....and relatively speaking they are.
Right now I am just posting pics of the Four Points......a discussion on each point will probably create a lot of discussion. I'm a little short of time right now, so I will add in as the discussion flows.
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I think this sticky really got lost somehow and the importance of it is just that ..... important! I am not sure if Corlay is correct or not but I am going to assume he is and I agree with him on his statement. Front side has been an issue for my DD and I think there is much more to it than just a firm front side. Ken posted some great pics that all show what Corlay is saying which is the quote above....... achieving a good front side resistance begins with what the drag foot does. Looking back I have seen my DD's foot getting turned to second base as Java mentioned in Drive Mechanics and is backward. This was years ago but I still see her knee somewhat past 90 at times which I have read a few times tonight that it is almost impossible to bring it back. Anyway, one sticky/thread led me to another and to another and finally to this one which has been limited on information for awhile.I think an important key to achieving good "front side resistance" begins with what the drag foot does.
You'll notice in all of Ken's photo examples above that each pitcher's thigh (with knee slightly bent) is oriented forward, roughly right down the "powerline". And shoe laces are also turned in a "forward facing" articulation of the ankle.
I think that this is essential to achieve the correct posture which helps realize good "front side resistance"