Per perfezionare il pugno ci vuole un allenamento costante.

From Lesson 451:Necessity (volerci)·Italian

Questions & Answers about Per perfezionare il pugno ci vuole un allenamento costante.

What exactly is ci vuole, and why wouldn't we just use serve?
ci vuole comes from the verb volerci, which is used to express what is required—whether time, effort, or a physical thing—to achieve a result. It translates neatly to English as 'it takes'. While you could technically use serve (is useful/needed) here, ci vuole is the most natural and standard way to express 'it takes [noun]' in Italian.
Why is it ci vuole instead of ci vogliono?
With volerci, the verb must agree with the thing that is needed, because that thing is the grammatical subject of the sentence. Here, the needed thing is un allenamento costante (a constant training), which is singular. If the requirement was plural, like 'many sacrifices', it would become ci vogliono molti sacrifici.
Why does the sentence start with Per perfezionare instead of just Perfezionare?
When you want to say 'In order to [do something]' or express a goal in Italian, you use per followed by the infinitive of the verb. Using per perfezionare clearly frames perfecting the punch as the goal that makes the training necessary.
I usually think of pugno as meaning 'fist'. Can it also mean the action of hitting?
Yes! pugno is used for both the anatomical fist (e.g., chiudere il pugno, to clench one's fist) and the physical strike delivered with it (e.g., dare un pugno, to throw a punch). In this sentence, the context tells us you are perfecting the strike, not the hand shape.
Could I use bisogna in this sentence instead to express the necessity?
Not with this exact structure. bisogna is also used for general necessity, but it must be followed by an infinitive verb (e.g., bisogna allenarsi, 'one must train'). Because this sentence uses a noun (un allenamento costante) as the thing that is required, you must use volerci or servire.

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