You can improve your endurance with the Nautilus T628. The treadmill features no less than 28 training programs, so you'll be sure to reach all your goals. You can use one of the interval programs, for example. You can set the speed, inclination, and a combination of both settings. Do you want to train to increase your running speed? The T628 can reach a speed of 20km per hour, allowing you to easily sprint all you want. The incline can be adjusted up to 15%. After your workout, you can check out your athletic performance details on your smartphone or tablet by linking the T628 via Bluetooth Smart. Just install the Nautilus Connect app to gain insight into a wealth of information.