The main possibilites to choose from when deciding what to stand on a standing desk are a combination of running or jogging shoes, standing desk mat, balance board, foam roller or foot roller, foot rest or foot stool, mini elliptical trainer or stepper, treadmill. For best results just keep it simple and get a few of these - this way you'll get the variety you need for healthy standing. Read more.
Quick tips: The desk should go low enough to sit at it comfortably... and high enough for comfortable standing, double check the height range. If it does not go low enough do not worry, you can get around it with a drafting stool. Get an electric desk with memory buttons for best comfort. Check the desk's depth and width so it matches your needs and your office's limits. Check the desk's max load - pneumatic desks can't hold much. Avoid desks with stabilizing bars between the legs - you'd hit this with your knee/shin when sitting down. Locking casters help you move around the desk or fix it in place as needed. Read more.
Set the height of your desk so that you can rest your elbow and forearm on it comfortably - when you put your forearms on the desk, your forearm and upper arm should be at 90 to 120 degrees. If you are unsure measure the distance between the floor and your elbow, and raise your desk to the this height. Read more.