Professional Treadmill

professional
a person engaged in one of the learned professions
an athlete who plays for pay
Of, relating to, or connected with a profession
(of a person) Engaged in a specified activity as one's main paid occupation rather than as a pastime
engaged in a profession or engaging in as a profession or means of livelihood; "the professional man or woman possesses distinctive qualifications"; "began her professional career after the Olympics"; "professional theater"; "professional football"; "a professional cook"; "professional actors
Having or showing the skill appropriate to a professional person; competent or skillful

treadmill
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
an exercise device consisting of an endless belt on which a person can walk or jog without changing place
A job or situation that is tiring, boring, or unpleasant and from which it is hard to escape
An exercise machine, typically with a continuous belt, that allows one to walk or run in place
a mill that is powered by men or animals walking on a circular belt or climbing steps
a job involving drudgery and confinement