George F Studor, Robert W Womack, Michael F Hilferty, William B Isbell, Jason A Taylor, Bruce R Bacon: Real time simulation using position sensing. Real Vision Corporation, Dorsey & Whitney, November 28, 2000: US06152856 (527 worldwide citation)

An interactive exercise system including exercise equipment having a resistance system, a speed sensor, a controller that varies the resistance setting of the exercise equipment, and a playback device for playing pre-recorded video and audio. The controller, operating in conjunction with speed infor ...