to contract muscles

The Spanish phrase 'contraer los músculos' translates to 'to contract muscles' in English. It refers to the action of a muscle or a muscle group making a movement by becoming shorter or tighter. This term can be used in a variety of contexts but is most commonly used in the fields of physiology and physical fitness. In these fields, muscle contraction can imply various body movements such as lifting weights, running, or simply doing physical exercises.