Treadmill Controller

controller
A person or thing that directs or regulates something
A person in charge of an organization's finances
restrainer: a person who directs and restrains
control: a mechanism that controls the operation of a machine; "the speed controller on his turntable was not working properly"; "I turned the controls over to her"
accountant: someone who maintains and audits business accounts

treadmill
a mill that is powered by men or animals walking on a circular belt or climbing steps
an exercise device consisting of an endless belt on which a person can walk or jog without changing place
An exercise machine, typically with a continuous belt, that allows one to walk or run in place
a job involving drudgery and confinement
A device formerly used for driving machinery, consisting of a large wheel with steps fitted into its inner surface. It was turned by the weight of people or animals treading the steps
A job or situation that is tiring, boring, or unpleasant and from which it is hard to escape