Standing desks are all about movement; the point of a sit-to-stand desk is to both stand and sit during your workday. Ergonomists call this "postural rotation." With that said, adding a standing desk mat keeps your feet and body comfortable while you stand. This is especially helpful if you are rocking high heels or some slick looking dress shoes that are made more for looks than comfort. But a standing marathon is not advised; always change positions.