Is playing tennis keeping a day holy and as a day of rest?

The Catholic Answers

Playing tennis is not sinful. It is neither holy nor wicked of itself. It is mental and bodily refreshment of one’s forces. But how far will you go? If I may not play tennis, may I exercise my limbs by walking? If I may not use my legs, may I use my eyes in reading? If not that, may I use my lungs by breathing? Where are you going to stop in the use of one’s faculties? Religion was not meant by God to be a strait-jacket of gloom.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty