Non-video game computer user interfaces utilize human foot action to generate input for controlling the interface (e.g., a graphical user interface). Computer systems that use such input may include: (a) at least one input system including one or more sensing devices for sensing action by one or more feet; (b) a data transmission system for transmitting the sensed foot action to (c) a processing system that utilizes the foot action input to provide control data input for a user interface; and (d) an output device for producing a non-video game computer output based, at least in part, on data provided by the processing system. The control data relating to the foot action is used, at least in part, for controlling a user interface associated with the computer output.