NOVELTY - The exercise apparatus (10) has a rotatable shaft supported and fixed to the frame at the bearings. A coil spring assembly (18) has a center end is fixed relative to the rotatable shaft and a peripheral end fixed relative to the support frame. A spool assembly (16) has a center fixed on the rotatable shaft and includes a winding drum. A length of lead line is windable on the spool assembly. The release of the length of the lead line drawn out from the spool assembly allows for a second rotational motion opposite the first in a manner that rewinds length of lead line on the spool assembly.    USE - Exercise apparatus for providing resistive force against ambulator motion of a user moving away from the device or a user who walks, steps or runs away from the machine as part of a strength training exercise program.    ADVANTAGE - The resistance exercise system can be easily used indoors or outdoors without concern for damaging the indoor floor surface or the outdoor turf. The system also provides a generally consistent resistive force more than one that dramatically increased during the exercise or one that provide a resistive force in jerking catches and releases. The system includes a gradual but consistent recoil at the end of the exercise so as to allow the user to return casually to the starting point of the exercise to complete the workout or to start the exercise again. The system provides an easy and accurate way for indicating the level of the resistive force, easily resetting itself without tangling or damaging the line attached between the device and the user.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an indicator device for providing an indication of a degree of adjustable frictional force between a rotating circular structure and a fixed frictional contact surface.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the exercise machine system.    Exercise apparatus (10)    Frame assembly (12)    Spool assembly (16)    Coil spring assembly (18)    Guide roller assembly (20)