How to throw a curveball or breaking ball

So you want to throw a curve ball? Usually, it's this middle finger, inside a seam. And what you want to do is throw it like a fastball to here [where the elbow and arm form an L, with your arm perpendicular to the ground], and turn your hand in.

You're pulling down the front of the ball, trying to increase the rate of rotation, which is usually 13 revolutions from the time it leaves your hand until it gets home.

Right here, like an L shape, I'm going to pull down on the ball and make it spin as much as I can. There's various ways to teach it and throw it.