My sewing room is in the basement. Its divided into 2 rooms, one side had 2 layers of indoor/outdoor carpet (not my choice, came with the house) and other side is plain old cement and not level at all. My machines are on the non carpeted side and I have feet and back issues so found myself a good pair of slippers with thick soles for cushion and then added one of the jigsaw puzzle type mats along the length of my frame. I can stand for hours though I don't. Also if I drop something it doesn't roll under the frame as easily if it hits the rubber mat, just does a short little bounce and sits there.