The constant thud underneath your feet. The constrained space. The monotony of going nowhere fast. Running on a treadmill can certainly feel like torture, but did you know it was originally used for that very purpose? Conor Heffernan details the dark and twisted history of the treadmill. [Directed by Yukai Du, narrated by Addison Anderson, music by WORKPLAYWORK and Cem Misirlioglu].