Keeping up with your walking and running goals in the winter can be a challenge. If you're an outdoor runner, cold and dark early mornings and late evenings limit your options for getting miles in.

If you're looking to spend under $500, this Urevo model—one of our editors' picks for the best foldable treadmills—is on sale for $280. (On the note of Urevo, I have this under-desk walking ...