Here is a treadmill that fits under your desk and lets you get more active at work. The JEMPET Under Desk Treadmill has a low profile design, so you can fit it under your bed when done. It can handle users up to 220lbs.
The JEMPET treadmill has a speed range of 0.5 to 3.7mph. It can be easily moved with the wheels in front of it. The digital display shows steps, time/speed, and calorie/distance info.