The Play 9 Plyo Ball Set with realistic seams has unmatched dependability and durability, created to withstand hundreds of throws, and designed for the most rigorous throwing programs in today's game! The ball is designed to be thrown into any hard, flat surface. Carry Bag Included. Adding a medicine ball to plyometric moves increases the challenge and calorie burn and recruits fast-twitch muscle fibers, the ones important for strength and power. Forcefully throwing and catching weighted objects is an excellent way to enhance upper body power and strength while simultaneously taxing your cardiovascular system. If you're ready to take your workout to the next level, consider adding the following high-intensity medicine ball exercises to your routine.