The reebok one gx50 elliptical cross trainer delivers a great impact free workout to test both the upper and lower body and motion is smooth thanks to the 9kg 20lbs flywheel the machine has a 38cm 15 stride length and 32 levels of electronic computer resistance to let you work as hard as you wish there are 21 programmes to choose from including time distance recovery calories and many more you can measure your heart rate via the pulse grip sensors and see this as well as speed tim