How to Say "treadmills" in Spanish
The Spanish word for “treadmills” is “cintas” — B1 level.
English → SpanishB1
nounB1
short for 'cinta de correr'

Examples
Las cintas transportadoras llevan el equipaje al avión.
The conveyor belts carry the luggage to the plane.
Prefiero correr en las cintas del gimnasio cuando llueve.
I prefer running on the treadmills at the gym when it rains.
Obtuvieron sus cintas negras después de muchos años de entrenamiento.
They obtained their black belts after many years of training.
Context is Key
When you hear 'cintas' in a gym, it almost always means 'treadmills' (short for 'cintas de correr'). When packing, it means 'conveyor belts'.
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