[quote=“dusty delso”]go to the pitching clips thread on this site. the sandy koufax clips side by side of koufax throwing a fastball and curveball synchronized side by side are outstanding. i’m sure if you find different clips from different years or games they may look different. these clips are from his perfect game and they are identical to my eye.
the recoil is a bit tough to explain, he does in the book but i’ll try to give you one of the short answers. if you flex or extend the spine to maximal levels using extremely fast movements like pitching, it is acceptable and actually normal for the spine to try to snap back to a more normal position. koufax pushed as hard as he possibly could off the rubber and when his front foot hit the ground and the knee flexed, after it flexed he pushed against the ground with his front foot to stop his trunk and transfer all the energy into his shoulder, arm and hand. this caused the two-armed catapult effect he talked about and also what he called the law of the flail which increased his arm and hand speed by 6 or 7 times. i’m not exactly clear what he was refering to with the law of the flail and actually e-mailed robert adair the professor who wrote the physics of baseball from yale university. he is a great man and didn’t know what koufax was talking about. i hope to get this answered someday.
anyway, when he transfers that much force from the back foot to the front foot and the back arces and then moves that far forward in a direct line to home plate, after the releaseand the arm slows down to the glove hand side of the body. the front leg will recoil energy backward as the back and trunk raise back up. this happens long after the ball is gone.
if you also notice, his back foot drag line is nowhere near straight toward the plate. it is angled toward the first base dugout. this is especially apparent in the footage of him striking out the yankees in the world series at yankee stadium. mantle never took the bat off his shoulder. he simply stated “how the @$^& you supposed to hit that”. enough said.[/quote]
I found this (especially the bolded part) quite interesting. I decided to try ‘pushing back’ with the front foot today while I was throwing. The results seemed big. I did not lose any accuracy (maybe even gained some) and I seemed to be throwing a lot faster. This was on flat ground. My finish was also more complete with a full leg swing and follow through. I’ll try to get video sometime… maybe over spring break
Edit: If this is in fact what many major leaguers do, wouldn’t this have implications on the amount of force applied by the front leg? I thought the NPA was planning on testing the force of the front leg? Did that ever happen?