In my opinion there is nothing more religious than having good health. I'm sick and tired of meeting so called, "religious people", that use Christianity as a crutch to defend their laziness.
Using religion as an alternative to exercise is a cope out, and it's a bullshit excuse. You need to workout consistently and take your health seriously for your entire life.
Almost half the bible talks about health and disease. There are numerous stories about lepers, disease, blind people, and infant mortality. The world didn't always have modern medicine and hospitals like we do today, and even in the year 1900 the life expectancy in the United States was only 50.