work performed by the user 39 s lower body a second analog display includes a scale 204 and an indicator 206 which moves along the scale 204 to indicate the percentage of work being performed by whichever portion of the user 39 s body is currently performing the majority of the work the user interface 200 also includes three led displays 207 209 which may be alternatively lit to indicate the relationship between the user 39 s current distribution of work and the user 39 s target distribution of work more specifically the illumination of display 207 signals the user to increase the effort on upper body exercise the illumination of display 208 signals the user to maintain the current distribution of work between upper body and lower body and the illumination of display 209 signals the user to increase the effort on lower body exercise those skilled in the art will recognize that audible signals may used together with or in place of visible signals another alternative user interface 210 is shown in fig6 two analog displays are aligned relative to one another to facilitate a visual comparison between the target distribution of work and the actual distribution of work each display includes an identical scale 214 and a respective indicator 216 or 218 the u201c target u201d indicator 216 moves along the upper scale 214 to indicate the user 39 s target distribution of work between upper body and lower body and the u201c actual u201d indicator 218 moves along the lower scale 214 to.