Most people buying a treadmill will be probably be faced with the choice: 'Do I want a folding treadmill or a non-folding treadmill?' Folding treadmills (also called fold-up, foldable and fold-away treadmills) are a popular choice among treadmill buyers. But apart from the obvious reason to choose a folding treadmill (to save space) - what are the REAL differences between a folding vs. non-folding treadmill? Here's a quick overview: The main advantages to choosing a folding treadmill are: -.