Selling Treadmill

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

selling
(sell) exchange or deliver for money or its equivalent; "He sold his house in January"; "She sells her body to survive and support her drug habit"
Give or hand over (something) in exchange for money
(of a thing) Be purchased
(sell) the activity of persuading someone to buy; "it was a hard sell"
Have a stock of (something) available for sale
the exchange of goods for an agreed sum of money