Treadmills are useful tools to get a cardio workout at home and burn calories. The Sunny Health & Fitness Manual Magnetic Treadmill provides you with a 41.7 x 13.4-inch running space. It folds for easy storage. You also get swing levels to get an upper body workout. This is ideal for people who don’t have a lot of space for exercise machines. Costs under $130 at this time.