They should only be thrown into screens or used for stretching exercises. STRENGTH BUILDER: Train with progressively heavier balls to work on building arm strength and throwing velocity. The Concept: Conditioning with weighted balls has been referred to as Overload Training. Many players agree that training with weighted balls can... Many players agree that weight variation training can increase their velocity when playing with a regulation game ball. CHAMPRO Weighted Training Softballs provide a way for players to improve their in-game performance. Champro Weighted Training Baseballs - Individual Size CHAMPRO Weighted Training Baseball – Leather Cover, Helps Improve Pitching & Hitting Mechanics (Individual Ball) Hitting Aid Champro Weighted Training Baseball Set. Sports Facilities Group Inc CHAMPRO’s weighted training softballs have stripe patterns that allow pitchers to monitor the pitch rotation, helping them develop their skill set. WARNING: Weighted balls should not be hit with a bat or thrown to another player. DURABLE CONSTRUCTION: These softballs have raised seams and leather covers that are made to last. CHAMPRO Weighted Ball Training Baseball And Softballs – TripleSSports Raised Seams Leather Training Balls CREATE A SET: Select your choice of weighted balls to create a weight variation set customized to your needs and goals.