True or false most pro boxers dont pivot the foot they push off it?

[Scrap]

You have completely lost me,

Maybe I lost myself lol. Okay if you're throwing an uppercut lifting both heels coming onto the ball of your front foot then that means.I should be able to lift my back leg up why because I'm on the ball of my front foot right?

But we are not trying to put the head forward, that wont generate power or purpose of what we are aiming for.