Medicine balls allow you to do explosive exerises such as slams, granny throws, and throwing the ball backwards over your head. These exercises help develop the posterior chain which is important in everyday tasks like standing up, squatting down to pick something up, as well as other things like deadlifting and squatting hudreds of pounds. Medicine ball training can help athletes such as football, rugby, basketball, and aussy rules players. Medicine balls also allow you to work in different planes of motion. Their are all kinds of things you can do with a medicine ball as a warmup to your actual workout like rotational handoffs, woodchops, swings, and presses. When I was in high school I used to take a 10 pound medicine ball and throw it against my stomach 50 times in a row while doing a leg lift. I do not know if that helped my jumping ability but I did dunk a softball at 5'9. If you want to learn more contact me.