Come si usa lo shaker (shakerare)

If the video can clarify any doubts, offer me a coffee, I'd be grateful !!  😉

(Incorrect Italianized verb born from the English noun shaker, but usually used in speech) 

It is well known that shaking, or rather, quickly cooling a mixed preparation, is first of all absolutely personal.
Each barman follows his style, his character and the form that best suits him but must still respect some fundamental rules.
The ingredients mixed with ice must cool quickly by moving from one end of the shaker to the other but without being watered down, which would make the drink really unpleasant.
In this video I will explain my personal way of using "boston" but the same small but important rules apply to a continental shaker as well.