With the advent of touch-free interfaces such as described in the present disclosure, it is no longer necessary for computer interfaces to be in predefined locations (e.g., desktops) or configuration (e.g., rectangular keyboard). The present invention makes use of touch-free interfaces to encourage users to interface with a computer in an ergonomically sound manner. Among other things, the present invention implements a system for localizing human body parts such as hands, arms, shoulders, or even the fully body, with a processing device such as a computer along with a computer display to provide visual feedback on the display that encourages a user to maintain an ergonomically preferred position with ergonomically preferred motions. For example, the present invention encourages a user to maintain his motions within an ergonomically preferred range without have to reach out excessively or repetitively.