Comfortable, Spacious Running Surface The spacious running surface is 20" by 60" (50cm by 150cm) & can accommodate extra-long strides. The coarse textured, 2.8mm thick orthopedic belt & eight compression shocks provide support, cushioning & excellent traction for more serious runners. The result? A more comfortable running surface that puts less stress on your joints. Intelli-Key Patent-pending Intelli-Key™ smart lighting system quickly & easily gets your workout started. Each console button flashes in blue in the proper sequence during the set-up process so you can get moving, faster. Intelli-Guard The built-in Intelli-Guard™ automatically stops the belt if you step off during your workout for added safety & is a major development in protecting treadmill users & those around them. With the Intelli-Guard™, you no longer have to worry about leaving your treadmill running if you have to step off to take a call. When your foot no longer continuously strikes the belt surface for 20 seconds, your treadmill will automatically pause. Intelli-Step Intelli-Step™ counts & records the number of steps you take & displays them on the console. More accurate than a pedometer, Intelli-Step automatically detects the impact of your foot striking the treadmill belt. Increasing step count is one of the foundations of the American Heart Association’s recommendations for improving heart & overall health. Exercise Programs Designed by exercise physiologists for optimal safety & effectiveness, our 17 preset workout programs can help you achieve your goal, whether it be weight loss, general health improvement or sports training. The TR4000i also offers two My Zone heart rate control programs & two customizable programs. With the My Zone constant program, you keep your heart rate at a constant level throughout your workout while the My Zone Interval program means that you can enter your own minimum & maximum heart rate. The tr