One of the biggest land mines for any coach ot instructor is to get into a discussion about stride length. It shouldn't be a problem, but it is. So here are 3 ways to look at it...
The stride is not the trigger for the throw. It's just a reaction to maintain momentum as the body tries to recover balance.
Front leg strides forward mostly as a counterbalance to body position over back leg - this keeps the throwing shoulder supported over the hip.
Front leg comes down as a reaction to upper body momentum. Simply fall forward.
Those 3 ideas pretty much say the same thing. You could interpret one as being from a fall-from-tall delivery and another as drop-and-drive. We'll deal with that argument ...
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FYI, the 129 degrees mentioned in this lesson is a reference to Tim Lincecum However, the examples here are not of currently active pitchers, but representations of old-school pitchers ...stride variations have been around since the beginning.