Here is another iPhone compatible treadmill that you can use in small rooms to get a good workout. The VERSADESK Ultra Slim Foldable Treadmill has a digital LED display to show your stats, such as time, calories, and distance. Thanks to WorkFitChallenge app, you can set goals and even challenge your friends or colleagues.
This treadmill folds in half for easy storage. It has an adjustable speed range of 0.35mph to 3.75mph. It has 250lbs weight capacity. You can find out more about it here.