Almost all home treadmills under $2,000 fold up and can be rolled away for easy storage. This is often called SpaceSaver design. The best treadmills do not fold up because they are much bigger and much more solid than the typical treadmill. This additional size and strength adds to their feeling of stability while being used.

For more information on choosing a treadmill, see

How to Choose a Treadmill

Treadmill Buying Tips

Big Guy – Big Treadmill

What is iFit?