How to throw a curveball?
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Imagine you are holding a frisbe (wrist cocked to the left, if right handed, and palm facing you) and are to throw it. With that same wrist position is how you throw a cure ball. Using your thumb, pointer and middle fingers position the ball like you are going to throw a 4 seamed fastball. Now look at the ball, rotate the ball so there is a "U" (in that position, like a reg. U) looking at you. Place your middle finger on the right stitch, and move it slighty to the inside, barley (but still) touching the stitch. Place your pointer next to it, and your thumb on the bottom. To throw it...as you bring your arm back, dont extend your arm fully behind you. as you bring your arm back and to the plate, bend it so you can get "on top on the ball". Imagin your are throwing a football/slider. That should now be the position of your hand. As you begin the throw rotate your pointer and middle fingers toward the plate. this will apply top spin to the ball. REMEMBER THE FRISBE HAND SHAPE.P.S. as your hand passes your shoulder, THUMB AND MIDDLE/POINTER SHOUD BE IN A STRAIGHT LINE.
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To properly throw a curveball, the pitcher cocks the wrist inward so that upon release the ball rolls forward over his index finger, creating the desired spin. The Magnus effect then produces a downward force on the ball; this combines with the force of gravity to make the ball curve down. It is a common misconception that throwing a curveball requires a wrist snapping motion during the release of the ball. It has been suggested that throwing curveballs can be dangerous for the elbow, but there are no differences in the motions of the shoulder and elbow joints between a fastball and a curveball[1].The direction of the break depends on the axis of spin of the ball. There are several different types of curveballs which break differently and move at different speeds. The two most popular are the "12-6" ("dropball" or "drop curve") and the standard power curve. The 12-6 is a slower curveball with a steeper break on the ball, whereas the power curve is thrown much harder and has a later, less pronounced break, down and away from the throwing arm. Both curveballs are effective when used by pitchers who utilize different styles of pitching.
Ideally, a curveball breaks just as it reaches the plate, causing the batter to swing above it. A curveball that fails to break soon enough is called a "hanging curve" and is much easier to hit. Also, batters anticipating a curveball may try to move forward (closer to the pitcher) in the batter's box to hit the ball before it breaks, or, put differently, before the downward angle becomes too great. There is actually no specific point where a ball breaks, but the deviation from a fastball trajectory becomes progressively greater as the ball approaches the plate.
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