This is a short video where Micheal Jordan is answering the question "How can I jump higher?"
Here is what he says
"I really don't understand the physics of jumping and how you increase that. The things that I can say that I did when I was a kid to improve my jumping, very basic things, I used to work on jump, I used to just try to jump and try to dunk and I guess if you exercise that muscle to that activity some how its gonna improve. How much it would improve? No one can really dictate who is gonna be the greatest leap of all time.....