TREADMILL

[noun] [C] - a wide wheel turned by the weight of people climbing on steps around its edge, used in the past to provide power for machines or, more usually, as a punishment for prisonersThe treadmill was introduced as a punishment in prisons in 1817.A treadmill is also an exercise machine which consists of a moving strip or two step-like parts on which you walk without moving forward.A treadmill is also any type of repeated work which is boring and tiring and seems to have no positive effect and no end.There were days when child-rearing seemed like an endless treadmill of feeding, washing and nappy-changing.