"I get my exercise acting as a pallbearer to my friends who exercise"

This quote by Chauncey Depew is a humorous way of expressing the idea that he does not get much exercise. By saying that he gets his exercise functioning as a pallbearer to his good friends who work out, he is implying that his good friends are the ones who are getting the exercise, while he is simply standing there carrying the casket. This quote is an easy going way of expressing the idea that he does not get much exercise, and it likewise functions as a suggestion that life is brief and that we ought to take advantage of it by taking care of our bodies. It is a tip to make the effort to exercise and stay healthy, as it is very important for our general wellbeing.