Key Treadmills

treadmills
(treadmill) an exercise device consisting of an endless belt on which a person can walk or jog without changing place
(treadmill) 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
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
(treadmill) a job involving drudgery and confinement

key
identify: identify as in botany or biology, for example
metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
cardinal: serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
A low-lying island or reef, esp. in the Caribbean