The Trainer is lighter weight and user-friendly for all skill levels. The Trainer is an affordable, rugged, quality-built solution for any commercial training facility or home gym. The Trainer comes with the same responsive belt technology as the TrueForm Runner, which makes it a perfect choice for any skill level. You will burn 44% more calories than on a motorized treadmill. Because the Trainer curve is so shallow, users feel safe and in control of their speed, whether walking, jogging, or running. The LCD is compatible with Polar heart rate monitor T31.