Abstract: A person to be tested steps on a pair of foot steps, and a plurality of body load detectors sense the body load of the person, as applied to the foot steps. An arithmetic circuit receives the body load signals and provides difference signals which are displayed so that the person being tested can observe them. The person being tested sees body load distribution patterns on the display, and adjusts his body balance as a function thereof. Maximum-length linear shift register signals are provided which unbalance the body load distribution of the person being tested while standing on the foot steps. When the person observes these signals in the form of target signals, that person attempts to adjust the body load distribution so as to result in a balanced condition.

Abstract: A foldable wheel chair wherein diagonal braces which are transversely foldable are coupled by universal joints to front and rear portions between two longitudinally foldable opposite side frames to prevent slidable motion. Caster wheels and drive wheels are mounted on the side frames thereby folding the wheel chair in longitudinal and transversal directions to render it compact.