Folding treadmills save a ton of indoor real estate ... If a good deal is what you’re after, consider the Xterra TR150 ...
This highly-rated treadmill from Urevo has a versatile two-in-one design: With the frame up, you can run up to 7.6 mph, and with the frame down, you can tuck it under your desk to walk up to 3.8 mph.