Abstract: A training ball for use by a pitcher in practicing throwing a curve ball and a method for using the training ball as described. The training ball has a first ball having approximately the size, weight, and surface of a regulation baseball, for being held and thrown by the pitcher, and a counterweight connected to the first ball at a fixed distance and position, to provide a mass balancing the mass of the first ball at a balance point approximately at the surface of the sphere defined by the surface of the first ball. The first ball may be a modified regulation baseball. The counterweight may be a second ball approximately identical in size and weight to the first ball. The method for using a training ball includes gripping and throwing the first ball as a curve ball, whereby the training ball will fly with a 12-6 spin toward the pitcher's target if the training ball is properly thrown.