How do I move my Proform Treadmill to another room without taking it apart completely. It will not fit thru the doorway and too heavy to lift alone.

I have moved this treadmill several times since we bough it. Up and down stairs and from one room to another. I also used to be a mover so I hope this helps. I am not sure what model you have but i have the 525x. To move it I make sure the incline is set to zero, list the track/running section and lock it into place with the locking pin located on one of the handles. The Proform i have has attached wheels so i lean it back and get it close to the door standing straight up. Once there I turn the treadmill slightly and get one side through the doorway then I pull it halfway through the doorway. If its a tile, wood or linoleum floor make sure to put a rug under the treadmill to protect the floor. It will also helo it slide through the doorway easier. Then tuun the treadmill slightly the other way and get the other half through the door. Once there i tilt it back on its wheels and move it where i want it.