Running in place has gotten a whole lot more interesting as treadmills evolve to include ... we found this belt—made from near-frictionless rubber slats—to be one of the easiest to move ...

I also really enjoyed its comfortable and cushioned belt, which provided one of the smoothest rides among the non-slat treadmills on this list, slightly edging out the NordricTrack 1750’s ...

NordicTrack offers a range of treadmills and other at-home workout machines for different fitness levels and preferences.