Convenience is the main appeal of a folding treadmill, so it’s best to set up and use it in the same room or area where it will be stored. Make sure it’s on a level surface and that the ceiling is high enough that you won’t hit your head. You should also use it in a well-ventilated room. If you plan to use it in a basement, make sure it’s stored in a place that’s cool and dry to keep it running smoothly.