Check the following Features Weight- Treadmill's Maximum user weight, Check program options, heart rate monitors, and other features like Motor Horsepower- Look for a motor with at least 1.5 continuous-duty horsepower (CHP). If you plan on running on the treadmill frequently, you'll be better off choosing 2.5 to 3.0 CHP. You will also need a more powerful motor, depending on your weight. Users: How many people will use it, and how often. Space: How much room do you have? And check folding or hydraulic treadmill. For the speed you plan on running, get a treadmill that goes up to 10 mph or higher. Hope my suggestion is useful fo you.