Sunny Health and Fitness Asuna SpaceFlex Electric Treadmill While most folding treadmills don't allow you to run on an incline, the Sunny Health and Fitness Asuna SpaceFlex Electric Treadmill ($823) is equipped with a 12-level auto-incline and can reach a speed of 8 mph. Oh, and it's rose gold, too. Image Source: amazon.com Sunny Health and Fitness Asuna SpaceFlex Electric Treadmill $823 from amazon.com Buy Now