The difference between a walking machine and a treadmill is that there is a greater chance of running than a walking machine. And the treadmill has the function of a walking machine. If you are at home and your home is not big enough, you can choose to buy a walking machine. If your home is big enough, you can choose to use the treadmill. There is another family situation in your family. If your family is obese, it is recommended to buy a walking machine first, because if your knees are bad or overweight, you should use a treadmill. Doing exercise is likely to hurt your knee, but at this time, choose soothing exercise first.