HuffingtonPost has up a link to a job posting for holiday workers at an Amazon.com warehouse in Kansas. Among the rigorous requirements for the job — among them, the ability to stand for 8-10 hours while continually bending and lifting, the wherewithal to call the warehouse a “fulfillment center” without snickering — there was one in particular that popped out: You have to be able to walk the equivalent of 10 to 15 miles a day. A day! All those endless choices to be had on the clean, easy interface of amazon.com really only means one thing: That there’s an equally endless warehouse where hardy Kansans are walking 75 miles a week to get you your wares before Christmas. Have you been inside one of these places? What’s the scoop?