Fitness experts routinely show beginners that there is a specific place in a training regimen for a medicine ball. When a user wants "higher resistance" training, where higher weights force the body to work harder, they can select medicine balls, tools that make the limbs work in concert with the back and core to move these heavy items. Medicine balls provide a different range of motion than alternatives like dumbbells, and that is one reason why so many trainers keep them on hand.
Medicine balls will improve sports performance, challenge your core, encourage socialization because you often need a partner, add variety to your routines, and are just plain fun!