Final answer:
The sentence in question is correct in the imperfect tense because it describes the regular activity of the swimming team practicing on Saturdays.
Step-by-step explanation:
The subject of the question is Spanish. The sentence in question is 'El equipo de natación entrenaba los sábados.' The imperfect tense is used to describe ongoing or repeated actions in the past. In this case, the sentence is correct because it describes the regular activity of the swimming team practicing on Saturdays.
Learn more about Correct usage of the imperfect tense in Spanish