Do not be found guilty of sneering at the Pharisees or becoming 'legalistic' in your attitude to the Sabbath Day. Consider instead the essence of the day. Then other things needed to be done however, they were done. God has laid down a pattern for man to follow. You just have to sit some exams or work a weekend on call to know that.
Leisure is great.
What a feeling to do something I enjoy. This Sabbath day has been given to me. Just as God provides order for my life, he provides a way to regenerate and refresh me. Make the Sabbath Day work for you. Much of my research is based on making accurate pH measurements.