Once you get good at shadowboxing then you can also show off a little too. Muhammed Ali would say this is how Sugar Ray Robinson would do it.

I remember their was a cuban fighter from the 50's who's name was Kid Chocolate/Cocoa, anyways a lot of his skill was was aftermath of carefull studing the films of other fighters before him. And I can imagine just like any good champion he had to train like one too.