Both can be utilized for walking workouts, but there are key differences that give TreadClimber machines a distinct advantage. A treadmill has only one moving belt while the TreadClimber has two independent treadles. The unique motion of the treadles provides several benefits by combining the motions of a treadmill, a stepper, and an elliptical. It not only burns more calories than walking on a treadmill at the same speed, but also creates a smooth low-impact motion. As you step forward and up, the treadles rise to meet your feet with every step. This significantly reduces impact to your joints. It's the ultimate combination of calorie burn and comfort!