I have tried helping a few older girls with bad throwing mechanics but it is tough. They have done the same bad mechanics for so long it is hard to get away from. Very similar to when pitchers have to switch their form.
Emphasizing throwing correctly at young ages should be a major part of their age groups.
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Exactly. When I was coaching 10U there was a girl that needed help. I gave her drills and instructions. I showed them to her and her parents, walked through them, gave them detailed instructions (with images) on paper, etc. Gave them the "do this daily for 15 minutes and you'll see huge improvements soon..." talk.
4 years later I watch her throw a ball and I cringe.
Hard work is hard work.