Computer-controlled apparatus for testing and measuring at least one of fat, water, bone mass, and muscle mass in a subject's body based on impedance measurements of the subject's body; Computer hardware and recorded software systems for measuring, analyzing and assessing at least one of fat, water, bone mass, and muscle in a subject's body based on impedance measurements of the subject's bodymeasuring, analyzing and assessing at least one of fat, water, bone mass, and muscle in a subject's b...