Back leg and the rubber

Ok I filmed myself today pitching and I can view the video in slow-mo and I noticed my back foot leaves the rubber before I release the ball. It’s not that much earlier but should it come off the rubber before I throw the ball? And if what I am doing is wrong what does this affect and how should I go about fixing it?

thats good timing. POST THE VIDEO ON HERE and we might be able to really help you.

Check out the video of Mark Prior on this site. If I recall correctly, you can’t see his back foot. But you can still tell it comes off the rubber - quite a ways, actually - before he releases the ball. That’s a good thing. It’s caused by momentum which is also a good thing.