How important is it to finish with the back leg swinging up and around rather than dragging it.
My son’s 13. He throws hard, has good control, and as a whole I’m not looking to change much in his mechanics.
I viewed some steps to increasing velocity with him. Videos were by Dick Mills. Anyway in his last step he talks about finishing with the trunk bent, head forward and facing the plate, and arm coming across the body. My son is doing a good job of this without much in the way of lifting the back or throwing side leg very much.
There’s probably successful MLB pitchers that have far less lift and rotation of the rear leg than say Lincecum, but this seems to be important to Lincecum’s velocity.
Also, what if any effects might this have on potential injury? My immediate thoughts would be that there’d be an opportunity for the pitching hand to travel further and increase the time for energy to be dissipated - a good thing.