Here is another compact treadmill that you can fit under your desk to get a fun cardio workout. The Xspec Under Desk Treadmill has a speed range of 0.5 to 4mph. It can handle users up to 265lbs in weight. Its LED display tracks steps, time, speed, calories burned, and distance.
The treadmill stands only at 4.5″ tall. It has a walking area of 39.3″ X14.3″.