Rod Cross has written a new article: "The Double Pendulum in Tennis" Do you swing your wrist or does the racquet swing it for you? Does the forearm speed up or slow down before impact? Is there an ideal weight relationship between racquet and forearm? Do you initiate your stroke with a limp or locked wrist? When does the wrist release? What happens if you increase the force exerted by the wrist? These and many other interesting questions are discussed. This article is a followup on his other recent article on "The Physics of the Kick Serve"