Non-Exertion Game
To measure the benefits of an exertion interface, a control group played the same game, but using a non-exertion, keyboard interface, still using the same life-size screen. The players hit a ball against a wall; however, in this version, they hit a virtual ball with a virtual foot, overlaid again on the video-conference. The player controls the intensity, the direction and spin with a keyboard interface, and the ball follows simulated physics in a virtual 3D environment to recreate a realistic experience. The input method used to apply force and direction to a virtual ball with a keyboard interface is similar to the one used in many golf and other sports simulations.
