A treadmill is an exercise machine for running or walking while staying in one place Treadmill or treadmilling may also refer to: Devices Hamster treadmill, a wheel found in a rodent's cage Omnidirectional treadmill, a device that allows a person to perform locomotive motion in any direction Penal treadmill, a treadmill that was used to extract labor from prisoners in Victorian prisons Science Euphemism treadmill, in sociolinguistics the tendency for euphemisms to become dysphemisms Hedonic treadmill, in positive psychology the tendency of a person to remain at a relatively stable level of happiness despite changes in fortune or the achievement of major goals Treadmilling, in molecular biology a phenomenon observed in many cellular cytoskeletal filaments Places Treadmill Ridge, a mountain located on the border of Alberta and British Columbia Fiction Cosmic treadmill, a fictional time travel device in the DC Comics universe See also Readmill, an ereader app available February 2011-July 2014 Treadwheel