The imperfect form 'entrenaba' in the Spanish sentence provided is correct as it portrays a past habitual action.
Spanish has an imperfective form, which can be used for habitual or continuous actions. In the sentence 'El equipo de natación entrenaba los sábados,' the imperfect form 'entrenaba' is correct as it indicates a past habitual action of the swimming team practicing on Saturdays.
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