The curveball grip is fairly simple and, unlike other pitches, allows a pitcher to maintain a good grip on the ball, and therefore, control, and throwing an effective curveball involves more than just your arm. There is no specific moment when a coach or parent will say it is time now to throw curving ball. However, the proper age for the player to be able to throw curving ball is 14 ... https://www.algopick.kr/