NOVELTY - The treadmill has motor driving portion that drives a driving motor. A control portion generates and transmits to the motor driving portion, a control signal for adjusting rotation speed of driving motor by using measured value corresponding to signal measured by exerciser detecting portion. The control portion has a sensitivity adjusting portion that adjusts control sensitivity (S410) by determining a change rate of subsequent data value with respect to preceding data value corresponding to measured value or converted value derived from the measured value.    USE - Treadmill.    ADVANTAGE - Provides a treadmill which promptly follows acceleration or deceleration of an exerciser, and can accept predetermined exercising patterns, thus improving exerciser's exercising feeling as if working out in actual ground. Prevents a motor driving portion from being tripped due to a load caused by rapid deceleration, by supplying motor driving portion with a control signal generated corresponding to control sensitivity. Adjusts a location of sensor for measuring exerciser's position so as to minimize noise and measurement errors contained in measured signals. Pre-processes measured values of exerciser's position to prevents problems in which belt's speed can not be controlled due to measurement errors contained in measured values.    DETAILED DESCRIPTION - The control signal is generated corresponding to the adjusted control sensitivity. The sensitivity adjusting portion enlarges or lowers the control sensitivity as the change range becomes larger or smaller, respectively. The sensitivity adjusting portion applies a stable section control sensitivity as the control sensitivity when a state value is not an accelerating/decelerating state (S4173). INDEPENDENT CLAIMS are included for the following:    (1) a control module; and    (2) a treadmill controlling method.    DESCRIPTION OF DRAWING(S) - The drawing is a flowchart of the sensitivity adjusting method performed by sensitivity adjusting portion.    Current state determination (S4150)    Speed/change rate determination (S4160)    Control sensitivity adjustments (S4170,S4171)    Set stable section control sensitivity as control sensitivity when state value is not accelerating/decelerating state (S4173)    Control gain computations (S4210,S4211)