Apparatus for improving health of a user is provided, including a first sensor, adapted to measure a first physiological variable, which is indicative of a voluntary action of the user. The methods may include performing three basic loops during the printing in the mono-color mode. The attachment comprises an elongated base member which on one side either permanently or removably retains a scrubber pad. An approximately hemispherical acetabular component is then disposed in the prepared acetabulum to provide for hip rotation relative to the femoral component.