first attempt at vid post

How tall is that kid? Looks like he has some decent height.

Hard to tell too much from a 3 second clip -- I would be interested in seeing more.

He is tall for 13. I think he needs to get some instruction on how to make better use of his legs -- so that he takes pressure off his arms and so he can increase velocity.

How fast does he throw?

Thanks for the comments.
He's a little taller than norm but not huge...about 5-7 (he plays with a 5-11 lefty).
As far as velocity, he works in the low/mid 70s so is a pretty hard thrower and has good control.

Yea, he needs to use his legs more, and drive that shoulder down. He's too straight up and down. Remember, the more you find wrong the more room there is for improvement. While it can be discouraging at first, it usually turns out being a positive. Like this past weekend I looked at a video of myself, and was literally disgusted; couldn't believe it was me. But I was throwing hard and well, so that means with the corrections I'll just get better. It's the same with your son. The more that's wrong, the more room there is for improvement. Just remember that, never get discouraged. He looks good though for 13. Keep it up.

I'm not a pitching coach and 3 second ain't long, but....
I really liked your son's clip. Wish I knew how to do that stuff!!

Good looking arm action. Needs to be a little more fluid.

Have him work with on his follow through. This is less stressful on the "decelerator" muscles and should help his control and increase his velocity. Have him to "hold" his balance point a little longer during pitching practice. This will help develop more control of his body and should improve his accuracy.
Good luck,
Fungo

Thanks for all the comments. We'll play around and post some follow up vid.

If you check out the clip of Robert Stock (see thread on General Items), you'll see a kid who looks very, very dynamic on the mound. Legs, torso, shoulders -- the kid puts his whole body into the pitch - and gets 90mph out of his 14y/o body.