Do Presbyterian Protestants have a 'day of rest' or a 'day of religious works'?

My own experience, growing up in Presbyterian Protestantism (four generations of Church of Scotland ministers) gave me the distinct impression that many influential people in that section of Christendom were treating 'Sunday' or 'the sabbath' as an opportunity to load heavy burdens on the congregation. I remember exhortations along the lines of 'you must think spiritual thoughts all day on a Sunday' and 'you must not let your mind wander'. Does Presbyterian Protestantism really believe that the sabbath is to be 'rest'? Or do they believe it is one day out of seven in which *maximum religious exertion* should occur? >For he that is entered into his rest, he also hath ceased from his own works, as God did from his. Hebrews 4:10.