FJRGerry
Abby's Dad
Below is a link of Sarah pitching where she doesn't replant or leap. This is a better example of proper mechanics.
http://www.discussfastpitch.com/softball-pitching/1158-sarah-pauly-super-slow-motion-video.html
To me shifting the pivot foot to the center of the pitching rubber by lifting it slightly doesn't offer an advantage (but to my understanding it's not legal), but leaping does give the pitcher an advantage since there isn't the drag of the rear foot thereby allowing her a longer stride.
http://www.discussfastpitch.com/softball-pitching/1158-sarah-pauly-super-slow-motion-video.html
To me shifting the pivot foot to the center of the pitching rubber by lifting it slightly doesn't offer an advantage (but to my understanding it's not legal), but leaping does give the pitcher an advantage since there isn't the drag of the rear foot thereby allowing her a longer stride.