Passage: James Douglas, editor of the Sunday Express, did not agree. Douglas was a dedicated moralist, an exponent of muscular Christianity, which sought to reinvigorate the Church of England by promoting physical health and manliness. His colourfully worded editorials on subjects such as "the flapper vote" (that is, the extension of suffrage to women under 30) and "modern sex novelists" helped the Express family of papers prosper in the cutthroat circulation wars of the late 1920s. These leader articles shared the pages of the Sunday Express with gossip, murderers' confessions, and features about the love affairs of great men and women of the past.

Question: James Douglas was a proponent of what type of Christianity?
muscular Christianity,