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One of the common flaws you will see even in otherwise strong pitchers is a tendency to stick their butts out toward first base (right handed pitcher) or third base (left handed pitcher) after they land. I call it monkey butt, since that’s how many primates “present,” while Rick Pauly calls it the “ninja” position.
No matter what you call it, what you end up with is a posture issue where the shoulders are not stacked up on top of the hips. Instead, the hips are cleared out of the way so the arm can come through the release zone unimpeded rather than making brush contact.
You can tell pitchers they need to stay stacked, hips under shoulders, but they can’t always feel what that means. In other words, they don’t realize they are sticking their butts back; that makes it pretty tough to correct.
One description I’ve heard of how to encourage them to keep the hips under the shoulder is to imagine cracking a walnut between the butt cheeks. If you do that, you will tend to bring the hips/butt in rather than sticking it out.
The problem with that is younger pitchers in particular may not have much experience cracking a walnut with their hands. So while they may nod and say ok, they may not quite be able to understand what you actually want them to do or how much pressure they need to apply.
The other night, however, I found a good cue that not only relates to a fairly common human experience; it also has the benefit of being one of those funny things you don’t ordinarily talk about, especially in a pitching lesson. It feels like you’re conspiring on a secret.
What I told a couple of pitchers with this issue was “Imagine you have a little gas getting ready to come out, but you don’t want to let it out. As you land, do what you need to do to hold it in.”
The pitchers immediately got the concept, and went from monkey butt to upright posture immediately.
I won’t say it’s a miracle cure. After a while they would get back into monkey butt position again. But by saying “hold the gas in” they’d immediately get back to better posture. I expect as they gain more experience they will learn to get the right position automatically – just like anything else.
If you have a pitcher who just can’t seem to avoid pushing her hips/butt back, give this cue a try. You may get some strange looks at first, but I’m pretty sure you’ll get the results you’re looking for quickly.
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After all, when throwing, her glove hand “goes to her heart, not back where you fart!!” Potty humor = an instant smash with my child!! 
I’m so proud of what she’s accomplished in just a handful of days! It’s so frustrating when you can recognize an issue, but are clueless on the fix! I appreciate all the education and I appreciate your encouragement! 
