FiveFrameSwing
Banned
I can tell you that the arm lockout is a tough one to fix. It's difficult to fix until they can get to the point they "pull" the ball around the circle.... I just went through this with my 13YO. I will share a drill we did DAILY....and it helped. To describe the drill... its a slow motion half circle where she literally WATCHES to make sure she is maintaining a slight bend in the elbow and palm under the ball on the back side of the circle. You'll see she starts off very slow watching and FEELING the proper articulations. Then progresses to get a little faster and a little faster and then does a series of glove tosses... then mixes in an actual throw.
https://www.youtube.com/watch?v=hDvPunXrOeo
Should NOT have to be forcing "palm up". The "palm to the side" here is fine.