The WalkingPad C1 Under-Desk Treadmill is very lightweight and compact. It is easy to move the treadmill around and fold it up after using it. The C1 does not have side rails, but it is so close to the ground that you don't really need it. The C1 pairs with the KS Fit app for workouts and metric tracking. Read our review of the WalkingPad C1 Under Desk Treadmill for more information on how to use this treadmill with your standing desk.| Treadmill Review Guru