For most of us, spending all day on our feet isn’t comfortable, and it isn’t necessary for health benefits, either. Instead, a balance of sitting and standing throughout the day is ideal. While Dr. Smith recommends a 2:1 or 3:1 ratio of standing to sitting, you should take into consideration your physical fitness and needs. Dr. Smith also says you can place one foot on an elevated surface to take pressure off one leg—alternating from side to side. "When using a standing desk, it is best to start with short periods, perhaps 15 minutes at a time, and gradually increase your tolerance," says Erin DiGangi, physical therapist in La Grange Park, Illinois. "If you start to lean on the desk or lock your knees, it may be time to sit for a bit," she adds.