The purpose of this drill is to improve reaction time and thinking at the plate. Paint several softballs with different bright colors, and place them in a bucket behind the mound. Have someone place one of the balls in the pitcher's glove without letting the batter see the color. The pitcher then calls out a color before pitching the ball. The batter can only swing if the ball matches the color the pitcher called out (and if the pitch is in the strike zone).