Like a Treadmill

When you say an action that has nothing to do with treadmills then "Like a treadmill" afterwards but in a cool voice so it seems cool

Person: "Mash potatoes, like a treadmill"

by Bosch... I'M NOT A NERD June 2, 2016

sweating like a fat bird on a treadmill

to feel the fear like a ,fat bird, trying to keep pace on a treadmill.

the moment dave realised he was trapped in a locked room with a hungry lion, he was sweating like a fat bird on a treadmill

by Glyn Master of Weasels May 21, 2007