I was more than please with this height adjustable rolling desk to use for our treadmill. It can also be used with a chair while you are sitting, but the adjustable pneumatic height feature was what we were looking for. This is so sturdy and heavy I think it will be perfect over the treadmill with the locking wheel feature in place. The base is a heavy steel, which will last for years, and the top is super wide and deep for your computer, monitor, two computers, books, or whatever. I was impressed by its large design. I also like the white. It comes with a handy little drawer, big enough for pens, notebook, or tablet. It also has a hook underneath to hang your headphones, or position wires. It adjust the height, you just press the handle on each side under the desk and it releases to slowly gain height. Press the handle and push down to lower the desktop. Very easy. It was not hard to put together, but the instructions only had pictures that were not the greatest. It took me about a little more than an hour to finish. I kept screwing in pieces the wrong direction, or attaching a piece upside down (so annoying), I had to take parts apart and redue. Other than that, I think most people could do it and love the results! Thanks Wayfair!