How to Say "fast mover" in Spanish
The Spanish word for “fast mover” is “bala” — C1 level.
English → SpanishC1
nounC1informal
someone moving quickly

Examples
Cuando le dije que la cena estaba lista, salió hecho una bala.
When I told him dinner was ready, he left like a shot (very quickly).
Mi hermana es una bala para los exámenes de matemáticas.
My sister is a whiz (or a sharp shooter/very fast) at math exams.
Use with 'Ser' or 'Ir'
We often use 'bala' with the verbs 'ser' (to be) or 'ir' (to go) to emphasize speed or skill. Think of 'bala' here as the epitome of speed.
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