Elliptical-ProForm-CardioHIIT Trainer - SMR (Silent Magnetic Resistance) The compact footprint takes up half the space of a normal elliptical exercise machine. A cross between a stair climber and an elliptical machine that exercises the whole body, allowing you to activate your calves, hamstrings, quads, glutes, biceps, and triceps—all in a single movement. Unit has minimal use, works great.