......is not the best way to throw this pitch IMO. Also it is not how the top slider pitchers in the world do it. I used to teach the slider like a karate chop, as do most instructors until I dug a little deeper and realized that the supinated karate chop is a slower weaker version of what big leagers throw. You can make the ball slide by throwing the karate chop, but the break is not as late or sharp, and the velocity is not were it could be.
If you are a pitcher that does not have the right arm action to throw a good curveball (or have a really low 3/4 to sidearm armslot), and your arm is in shape and good enough to throw over 83mph you may want to experiment with this pitch.
-Hold the ball off center toward thumb side and fairly deep (experiment with seams, and how offcenter you can get the ball without losing balance and control of the pitch)
-Throw the ball with fastball effort and handspeed
-Make an effort to throw this pitch downhill.
-Make sure your hand stays on top of the ball (no karate chop) while you make the ball release off of the thumb side of your index finger. You will be able to feel a great deal of fricton on the side of your index finger when thrown correctly.
I have thrown both, and IMO there is no comparison.
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