I want their body to be the center of their arm action. Like this... and not throwing across their bodies.
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That’s fair. But understand what you want them to be and what works best for them could be two different things. Like mentioned before....try everything. Keep what works. Throw away what doesn’t.
Their mother was taught to open up and pivot the body open with turning the back foot by John Gay. She became a good pitcher regardless of how I tried to correct her. She did the monkey butt or clearing the pelvis for her arm action.
BTW. These are my nieces kids. I’m simple known as uncle Shawn.
You already know the answers. Monkey butt for sure. No brush whatsoever. She actually looks really good despite those things but she can be so much better and I think you know that already. Teach her to brush and throw the ball down. Pretend there is a bug on the ground 3 feet in front of her and throw it down! Kill that bug! THROW IT DOWN! notice I didn't say pitch it. THROW IT!!! When you do that everything works and the forearm can brush and roll around the hip to make that happen.
She looks amazingly athletic and she can go really far. Just a few changes and your DD will kill it!!! As I always say to everyone, reach out, let me explain it to you, and then decide if it is for you. I am happy to help or at least have a discussion. Just don't let time go by without exhausting your options. I did that with my oldest and regret it....
S3