The BEST under desk treadmill for a sit stand desk - IT FOLDS!! (Full Review) In this video, Will reviews the smart treadmill he recently bought called the WalkingPad. It's an amazing and innovative treadmill designed for under desks that has the ability to be folded in half, making it extremely convenient! Anyone who works sitting down at a desk for prolonged periods should strongly consider getting a sit/stand desk and also an under the desk treamill as it is significantly healthier for you to use day to day.