A big complaint of treadmills that fold is their stability, many older models did sacrifice stability, and cheaper models will be less stable because of how they are built. Stability and durability is very important when it comes to treadmills because a shaky treadmill will jar you and lessen the effectiveness of your workout. When you are looking at different folding models you should test as many as you can out to see how stable they are and how well they absorb impact.

When you decide to buy a folding treadmill, you should not only consider the space you will save but see to it that you will not sacrifice other features you need. There are some things you must consider when you buy a folding treadmill. It is important for you to find folding treadmills that could be easily folded up or down without exerting too much effort.

If you will be moving the folding treadmill a lot, you must consider its weight capacity. As all or almost all folding treadmills are designed to move, see to it that you won't have a hard time folding or carrying it.

Folding units, by the nature of their design, are generally not as stable as non-folding machines. (That doesn't mean they are not stable, it just means they are not AS stable). This is an important consideration when buying. According to Runner's World, stability is the most important quality of a good treadmill. For example, you don't want the treadmill to shake or wobble when you pick up your pace.

While there are a number of factors that contribute to stability (like user weight capacity, unit weight, quality of construction, etc.) foldability is one of them. This is why, if you look at stability ratings for various treadmills, non-folding machines almost always come out on top. This is also why most commercial or health club treadmills do not fold.