For the second phase of this shoulder prevention pitching drill one athlete will continue facing forward while the opposite athlete turns to face their partner. Athlete facing their partner will be performing the should prevention portion of this phase of the pitching drill while partner the facing forward will be focused on strengthening their core.
A) Wrap the curve: This is when you throw the ball with a bent wrist. It is called wrapping the curveball. There is a reason why coaches like to teach this method to pitcher’s; it works! The problems arise when a pitcher complains of sharp and deep elbow pain. Throwing a curveball like this is also a hit and a miss with your control. Some days you’ll find the strike zone with it and others you won’t. The overall issue I have with it is that is unhealthy to throw like this.
Armando Galarraga threw sliders 38.9% of the time in 2008, more than any other starting pitcher in the majors, and Ryan Dempster threw them 32.9% of the time, more than any other NL starting pitcher.[2] In 2008 CC Sabathia had the most effective slider, among major league starting pitchers.[3] Zack Greinke won the AL Cy Young award in 2009 in large part because of his slider, one of the better pitches in all of baseball.[4] In 2011, Clayton Kershaw won the Triple Crown by allowing only a .117 average against his slider.[5]
In order to master the curveball, you must start by gripping the ball with your middle and index fingers together, with the fingers across the seams of the ball at the widest part (the widest distance between the seams). Keeping a tight grip on the ball, especially with the middle finger, don’t let the ball touch the palm of your hand, or you won’t generate enough topspin, which is what allows the ball to drop when it gets close to home plate.
At the end of this corresponding video, you will look at a short clip from the Best of the Best.  Where a Slider thrown by Clayton Kershaw, is featured from a breakdown video/post I recently did of the lefty.  In slow motion, you can see that he has done everything correctly in his mechanics to enable him to Stay Behind the Baseball, Release it ‘Out in Front, and Throw it Downhill.  As for result, well it speaks for itself.

Place your thumb. Place your thumb under the opposite inside seam of the ball. The further your thumb is from your other 2 fingers, the more the pitch will drop. The closer your thumb is to your other two fingers, the more it will slide. If your index and middle fingers are at a 10 or 11 o'clock position, your thumb should be at a 4 or 5 o'clock position.
As a curveball flies through the air, the spin creates an imbalance of air pressure on either side of the ball. According to Bernoulli's principle, this imbalance of air pressure creates lift. When applied to a spinning object, the Magnus Effect holds that the force of lift generated will cause the spinning ball to move in the direction of lower pressure.
For all three variations of the preventative youth pitching drills athletes will perform 2-3 sets of 8-10 repetitions per arm. Athletes need to rotate through this pitching drill with their partners moving from the shoulder portion into the abdominal portion. Rotating positions will act as the rest period for the athletes which is why rotating after every set is important to keep athletes arms and abs fresh for the next set of pitching exercises. This pitching drill is a great way to get athletes shoulders and core warmed up before a game or training session and should be utilized before athletic activity is performed.
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From the wind-up position have the pitcher rock, turn and raise his leg to the balance position. However, instead of either stopping, or going on to pitch, he now lowers that leg to the ground next to and immediately behind the pivot foot. He should now be standing facing either 3b (rh) or 1b (LH), in good balance before beginning. Now he simply re-raises the non-pivot foot and pitches.

I learned this pitching drill from Coach Scott Birchler who was a high school coach at our rival high school but as I got older and made the transition from player to coach, he helped me a lot. This pitching drill that he taught me is great for any pitcher who wants to be more consistent with their curveball or slider and fixes two of the biggest problems in guys who throw these pitches, dropping that elbow and not finishing the pitch.