This must be how city cats get their exercise in. Oskar, the blind cat who's a YouTube sensation, and his pal Klaus take a daily (or more than once daily) stroll down the hall in their apartment building. Apparently this is a favorite activity of Oskar's — he strains to reach the doorknob to get out when he knows it's time to go. 

He starts out using the wall (and Klaus) as a guide, but isn't afraid to hop right over his feline friend and take the lead.