The CT900 Treadmill with robust commercial-grade construction, powerful motor allows owners to feel confident they have products that will stand the test of time. Our Heart Rate % Profile gives you a quick reference of your % compared to maximum projected heart rate. The LED lights up in Amber for 50-60%, Green for 65% to 80%, and Red for 85%+. 6 cushions evenly distributed throughout the unit and a roomy 22 x 62 inch workout surface ensure a comfortable experience. Oversize pulleys and 12 groove poly-v belt with tensioning idler reduce stress on the system for added reliability.