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This drill is for the pitcher looking to learn the proper feel for a true curveball. Don't throw curveballs until about 14-15 years of age.
Fill a tennis ball can with some rocks to give it weight. Go through the wind-up and throw the tennis ball can in the same manner you would throw a curveball. The goal is to get the can to spin perpendicular to the ground. This simulates the proper release point and arm angle necessary to throw a true curveball. The key is to get a 12 o'clock to 6 o'clock spin.